Rockstop RSH4 module. It is brand new in the package. This is interchangeable with the W series modules. The RSH4 is usually for a 28" draw length.
I also have a W3 module that is used but like new. This is usually for a 29" draw length.
Both modules will fit a wide variety of Fred Bear, Jennings and Buckmaster bows. The RSH (Rockstop) and W modules are interchangeable. Both will work on left or right handed bows. The Rockstop modules provide a more solid wall.