The world championships winning ProStops are now for purchase for Prime bows.
There are 4 options.
Hard Limb Stops: This is the hardest wall possible. The machined metal stop contacts the limb providing a super hard stop.
Compression Limb Stop: This puts a rubber coating on teh top to give you a hard limb stop with just a small amount of give.
Hard Cable Stop: A metal stop that contacts the cables giving a hard wall without using the limb stop.
Compression Cable Stop: Cable stop with just a little bot of give in the stop to help settle into the wall.