diff --git a/native_mate/arguments.h b/native_mate/arguments.h
index 054e03abf84..ebe49e7c841 100644
--- a/native_mate/arguments.h
+++ b/native_mate/arguments.h
@@ -56,6 +56,10 @@ class Arguments {
     return true;
   }
 
+  v8::Handle<v8::Object> GetThis() {
+    return info_->This();
+  }
+
 #if NODE_VERSION_AT_LEAST(0, 11, 0)
   template<typename T>
   void Return(T val) {
diff --git a/native_mate/constructor.cc b/native_mate/constructor.cc
index 2ab6459e8d3..9c57fd09c31 100644
--- a/native_mate/constructor.cc
+++ b/native_mate/constructor.cc
@@ -4,39 +4,37 @@
 
 #include "native_mate/constructor.h"
 
+#include "base/bind.h"
+#include "base/strings/string_piece.h"
+#include "native_mate/arguments.h"
 #include "native_mate/function_template.h"
-#include "native_mate/object_template_builder.h"
 
 namespace mate {
 
-Constructor::Constructor(const base::StringPiece& name) : name_(name) {
+Constructor::Constructor(const base::StringPiece& name,
+                         const WrappableFactoryFunction& factory)
+    : name_(name), factory_(factory) {
 }
 
-Constructor::~Constructor() {
+virtual Constructor::~Constructor() {
   constructor_.Reset();
 }
 
-v8::Handle<v8::Function> Constructor::GetFunction(v8::Isolate* isolate) {
+v8::Handle<v8::FunctionTemplate> Constructor::GetFunctionTemplate(
+    v8::Isolate* isolate) {
   if (constructor_.IsEmpty()) {
     v8::Local<v8::FunctionTemplate> constructor = CreateFunctionTemplate(
-        isolate,
-        base::Bind(&Constructor::New, base::Unretained(this)));
+        isolate, base::Bind(&Constructor::New, base::Unretained(this)));
     constructor->InstanceTemplate()->SetInternalFieldCount(1);
     constructor->SetClassName(StringToV8(isolate, name_));
-    SetPrototype(isolate, constructor->PrototypeTemplate());
-
     constructor_.Reset(isolate, constructor);
   }
 
-  return MATE_PERSISTENT_TO_LOCAL(
-      v8::FunctionTemplate, isolate, constructor_)->GetFunction();
+  return MATE_PERSISTENT_TO_LOCAL(v8::FunctionTemplate, isolate, constructor_);
 }
 
-void Constructor::New() {
-}
-
-void Constructor::SetPrototype(v8::Isolate* isolate,
-                               v8::Handle<v8::ObjectTemplate> prototype) {
+void Constructor::New(mate::Arguments* args) {
+  MATE_SET_INTERNAL_FIELD_POINTER(args->GetThis(), 0, factory_.Run());
 }
 
 }  // namespace mate
diff --git a/native_mate/constructor.h b/native_mate/constructor.h
index 45786fdb341..77446faee50 100644
--- a/native_mate/constructor.h
+++ b/native_mate/constructor.h
@@ -5,30 +5,176 @@
 #ifndef NATIVE_MATE_WRAPPABLE_CLASS_H_
 #define NATIVE_MATE_WRAPPABLE_CLASS_H_
 
-#include "native_mate/wrappable.h"
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+#include "base/strings/string_piece.h"
+#include "native_mate/function_template.h"
+#include "v8/include/v8.h"
 
 namespace mate {
 
+class WrappableBase;
+
+namespace internal {
+
+// This set of templates invokes a base::Callback by converting the Arguments
+// into native types. It relies on the function_template.h to provide helper
+// templates.
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*()>& callback) {
+  return callback.Run();
+};
+
+template<typename P1>
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*(P1)>& callback) {
+  typename CallbackParamTraits<P1>::LocalType a1;
+  if (!GetNextArgument(args, 0, false, &a1))
+    return NULL;
+  return callback.Run(a1);
+};
+
+template<typename P1, typename P2>
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*(P1, P2)>& callback) {
+  typename CallbackParamTraits<P1>::LocalType a1;
+  typename CallbackParamTraits<P2>::LocalType a2;
+  if (!GetNextArgument(args, 0, true, &a1) ||
+      !GetNextArgument(args, 0, false, &a2))
+    return NULL;
+  return callback.Run(a1, a2);
+};
+
+template<typename P1, typename P2, typename P3>
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*(P1, P2, P3)>& callback) {
+  typename CallbackParamTraits<P1>::LocalType a1;
+  typename CallbackParamTraits<P2>::LocalType a2;
+  typename CallbackParamTraits<P3>::LocalType a3;
+  if (!GetNextArgument(args, 0, true, &a1) ||
+      !GetNextArgument(args, 0, false, &a2) ||
+      !GetNextArgument(args, 0, false, &a3))
+    return NULL;
+  return callback.Run(a1, a2, a3);
+};
+
+template<typename P1, typename P2, typename P3, typename P4>
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*(P1, P2, P3, P4)>& callback) {
+  typename CallbackParamTraits<P1>::LocalType a1;
+  typename CallbackParamTraits<P2>::LocalType a2;
+  typename CallbackParamTraits<P3>::LocalType a3;
+  typename CallbackParamTraits<P4>::LocalType a4;
+  if (!GetNextArgument(args, 0, true, &a1) ||
+      !GetNextArgument(args, 0, false, &a2) ||
+      !GetNextArgument(args, 0, false, &a3) ||
+      !GetNextArgument(args, 0, false, &a4))
+    return NULL;
+  return callback.Run(a1, a2, a3, a4);
+};
+
+template<typename P1, typename P2, typename P3, typename P4, typename P5>
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*(P1, P2, P3, P4, P5)>& callback) {
+  typename CallbackParamTraits<P1>::LocalType a1;
+  typename CallbackParamTraits<P2>::LocalType a2;
+  typename CallbackParamTraits<P3>::LocalType a3;
+  typename CallbackParamTraits<P4>::LocalType a4;
+  typename CallbackParamTraits<P5>::LocalType a5;
+  if (!GetNextArgument(args, 0, true, &a1) ||
+      !GetNextArgument(args, 0, false, &a2) ||
+      !GetNextArgument(args, 0, false, &a3) ||
+      !GetNextArgument(args, 0, false, &a4) ||
+      !GetNextArgument(args, 0, false, &a5))
+    return NULL;
+  return callback.Run(a1, a2, a3, a4, a5);
+};
+
+template<typename P1, typename P2, typename P3, typename P4, typename P5,
+    typename P6>
+inline WrappableBase* InvokeFactory(
+    Arguments* args,
+    const base::Callback<WrappableBase*(P1, P2, P3, P4, P5, P6)>& callback) {
+  typename CallbackParamTraits<P1>::LocalType a1;
+  typename CallbackParamTraits<P2>::LocalType a2;
+  typename CallbackParamTraits<P3>::LocalType a3;
+  typename CallbackParamTraits<P4>::LocalType a4;
+  typename CallbackParamTraits<P5>::LocalType a5;
+  typename CallbackParamTraits<P6>::LocalType a6;
+  if (!GetNextArgument(args, 0, true, &a1) ||
+      !GetNextArgument(args, 0, false, &a2) ||
+      !GetNextArgument(args, 0, false, &a3) ||
+      !GetNextArgument(args, 0, false, &a4) ||
+      !GetNextArgument(args, 0, false, &a5) ||
+      !GetNextArgument(args, 0, false, &a6))
+    return NULL;
+  return callback.Run(a1, a2, a3, a4, a5, a6);
+};
+
+}  // namespace internal
+
+
+template<typename Sig>
 class Constructor {
  public:
-  v8::Handle<v8::Function> GetFunction(v8::Isolate* isolate);
+  typedef base::Callback<Sig> WrappableFactoryFunction;
 
- protected:
-  Constructor(const base::StringPiece& name);
-  virtual ~Constructor();
+  Constructor(const base::StringPiece& name) : name_(name) {}
+  virtual ~Constructor() {
+    constructor_.Reset();
+  }
 
-  virtual void New() = 0;
+  v8::Handle<v8::FunctionTemplate> GetFunctionTemplate(
+      v8::Isolate* isolate, const WrappableFactoryFunction& factory) {
+    if (constructor_.IsEmpty()) {
+      v8::Local<v8::FunctionTemplate> constructor = CreateFunctionTemplate(
+          isolate, base::Bind(&Constructor::New, factory));
+      constructor->InstanceTemplate()->SetInternalFieldCount(1);
+      constructor->SetClassName(StringToV8(isolate, name_));
+      constructor_.Reset(isolate, constructor);
+    }
 
-  virtual void SetPrototype(v8::Isolate* isolate,
-                            v8::Handle<v8::ObjectTemplate> prototype);
+    return MATE_PERSISTENT_TO_LOCAL(
+        v8::FunctionTemplate, isolate, constructor_);
+  }
 
  private:
+  static void New(const WrappableFactoryFunction& factory, Arguments* args) {
+    WrappableBase* object = internal::InvokeFactory(args, factory);
+    if (object)
+      MATE_SET_INTERNAL_FIELD_POINTER(args->GetThis(), 0, object);
+    else
+      args->ThrowError();
+
+    MATE_METHOD_RETURN_UNDEFINED();
+  }
+
   base::StringPiece name_;
   v8::Persistent<v8::FunctionTemplate> constructor_;
 
   DISALLOW_COPY_AND_ASSIGN(Constructor);
 };
 
+
+template<typename T>
+WrappableBase* NewOperatorFactory() {
+  return new T;
+}
+
+template<typename Sig>
+v8::Local<v8::FunctionTemplate> CreateConstructor(
+    v8::Isolate* isolate,
+    const base::StringPiece& name,
+    const base::Callback<Sig>& constructor) {
+  return Constructor<Sig>(name).GetFunctionTemplate(isolate, constructor);
+}
+
 }  // namespace mate
 
 #endif  // NATIVE_MATE_WRAPPABLE_CLASS_H_
diff --git a/native_mate/wrappable.cc b/native_mate/wrappable.cc
index 77bd721ad2f..e6dd876e966 100644
--- a/native_mate/wrappable.cc
+++ b/native_mate/wrappable.cc
@@ -9,26 +9,26 @@
 
 namespace mate {
 
-Wrappable::Wrappable() {
+WrappableBase::WrappableBase() {
 }
 
-Wrappable::~Wrappable() {
+WrappableBase::~WrappableBase() {
   MATE_PERSISTENT_RESET(wrapper_);
 }
 
-ObjectTemplateBuilder Wrappable::GetObjectTemplateBuilder(
+ObjectTemplateBuilder WrappableBase::GetObjectTemplateBuilder(
     v8::Isolate* isolate) {
   return ObjectTemplateBuilder(isolate);
 }
 
 // static
-MATE_WEAK_CALLBACK(Wrappable::WeakCallback, v8::Object, Wrappable) {
-  MATE_WEAK_CALLBACK_INIT(Wrappable);
+MATE_WEAK_CALLBACK(WrappableBase::WeakCallback, v8::Object, WrappableBase) {
+  MATE_WEAK_CALLBACK_INIT(WrappableBase);
   MATE_PERSISTENT_RESET(self->wrapper_);
   delete self;
 }
 
-v8::Handle<v8::Object> Wrappable::GetWrapper(v8::Isolate* isolate) {
+v8::Handle<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate) {
   if (!wrapper_.IsEmpty()) {
     return MATE_PERSISTENT_TO_LOCAL(v8::Object, isolate, wrapper_);
   }
diff --git a/native_mate/wrappable.h b/native_mate/wrappable.h
index b6b80789887..10391fae1d1 100644
--- a/native_mate/wrappable.h
+++ b/native_mate/wrappable.h
@@ -18,12 +18,12 @@ void* FromV8Impl(v8::Isolate* isolate, v8::Handle<v8::Value> val);
 }  // namespace internal
 
 
-// Wrappable is a base class for C++ objects that have corresponding v8 wrapper
-// objects. To retain a Wrappable object on the stack, use a mate::Handle.
+// WrappableBase is a base class for C++ objects that have corresponding v8 wrapper
+// objects. To retain a WrappableBase object on the stack, use a mate::Handle.
 //
 // USAGE:
 // // my_class.h
-// class MyClass : Wrappable {
+// class MyClass : WrappableBase {
 //  public:
 //   // Optional, only required if non-empty template should be used.
 //   virtual mate::ObjectTemplateBuilder GetObjectTemplateBuilder(
@@ -33,7 +33,7 @@ void* FromV8Impl(v8::Isolate* isolate, v8::Handle<v8::Value> val);
 //
 // mate::ObjectTemplateBuilder MyClass::GetObjectTemplateBuilder(
 //     v8::Isolate* isolate) {
-//   return Wrappable::GetObjectTemplateBuilder(isolate).SetValue("foobar", 42);
+//   return WrappableBase::GetObjectTemplateBuilder(isolate).SetValue("foobar", 42);
 // }
 //
 // Subclasses should also typically have private constructors and expose a
@@ -42,43 +42,57 @@ void* FromV8Impl(v8::Isolate* isolate, v8::Handle<v8::Value> val);
 // wrapper for the object. If clients fail to create a wrapper for a wrappable
 // object, the object will leak because we use the weak callback from the
 // wrapper as the signal to delete the wrapped object.
+template<typename T>
+class Wrappable;
+
 class ObjectTemplateBuilder;
 
 // Non-template base class to share code between templates instances.
-class Wrappable {
- public:
-  // Retrieve (or create) the v8 wrapper object cooresponding to this object.
-  v8::Handle<v8::Object> GetWrapper(v8::Isolate* isolate);
-
+class WrappableBase {
  protected:
-  Wrappable();
-  virtual ~Wrappable();
+  WrappableBase();
+  virtual ~WrappableBase();
 
   virtual ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate);
 
-  // Override to change how the v8 wrapper is built (by default it was built
-  // from the ObjectTemplateBuilder.
-  // virtual v8::Handle<v8::Object> BuildObject();
+  v8::Handle<v8::Object> GetWrapperImpl(v8::Isolate* isolate);
 
  private:
-  static MATE_WEAK_CALLBACK(WeakCallback, v8::Object, Wrappable);
+  static MATE_WEAK_CALLBACK(WeakCallback, v8::Object, WrappableBase);
 
   v8::Persistent<v8::Object> wrapper_;  // Weak
 
+  DISALLOW_COPY_AND_ASSIGN(WrappableBase);
+};
+
+
+template<typename T>
+class Wrappable : public WrappableBase {
+ public:
+  // Retrieve (or create) the v8 wrapper object cooresponding to this object.
+  v8::Handle<v8::Object> GetWrapper(v8::Isolate* isolate) {
+    return GetWrapperImpl(isolate);
+  }
+
+ protected:
+  Wrappable() {}
+  virtual ~Wrappable() {}
+
+ private:
   DISALLOW_COPY_AND_ASSIGN(Wrappable);
 };
 
 
-// This converter handles any subclass of Wrappable.
+// This converter handles any subclass of WrappableBase.
 template<typename T>
 struct Converter<T*, typename enable_if<
-                       is_convertible<T*, Wrappable*>::value>::type> {
+                       is_convertible<T*, WrappableBase*>::value>::type> {
   static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, T* val) {
     return val->GetWrapper(isolate);
   }
 
   static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val, T** out) {
-    *out = static_cast<T*>(static_cast<Wrappable*>(
+    *out = static_cast<T*>(static_cast<WrappableBase*>(
         internal::FromV8Impl(isolate, val)));
     return *out != NULL;
   }
diff --git a/native_mate_files.gypi b/native_mate_files.gypi
index 934c91f2323..944483e4863 100644
--- a/native_mate_files.gypi
+++ b/native_mate_files.gypi
@@ -4,7 +4,7 @@
       'native_mate/arguments.cc',
       'native_mate/arguments.h',
       'native_mate/compat.h',
-      'native_mate/constructor.cc',
+# 'native_mate/constructor.cc',
       'native_mate/constructor.h',
       'native_mate/converter.cc',
       'native_mate/converter.h',