KICK-EEZ Sorbothane RECOIL INSERTS provide an additional layer of recoil protection. These inserts fit precisely into the KICK-EEZ SLIP-OVER RECOIL PAD... or they can easily be added to any of the most popular "slip-on" style recoil pads (trim to fit if needed). KICK-EEZ RECOIL INSERTS are perfect for adjusting length-of-pull, just add or combine inserts to modify your length-of-pull as needed.