Raycast Collider

Hi, i am following a tutorial (is from Unity 3d 3) in Unity 3d 4 and in some point it tell me that i must create a empty GameObject and in that add two components: one is a RigidBody, the other is a Raycast Collider. The problem is that i can´t find the Raycast Collider Component. In Unity 4 this component are erase?

Thanks and sorry for my bad english.

Thanks! and yes i see very errors in this tutorial, but i can figure how do the things and work. But with the Collider Component was too much hehe.