cowcow hi capa recoil buffer saetCowCow has made a set of 4 different buffer spacers that can be inserted to either give less recoil on the gun or give extra fast response when you shoot with them. All the rubber spacers are made of anti oil rubber, you also get 3 stainless steel spacers that can be used as well. There are 4 different hair types in the package: Yellow 45 degrees Red 55 degrees Blue 65 degrees Black 75 degrees