The Sims Limbsaver AirTech Slip-On Recoil Pads atmospheric chambers produce a substantial increase in performance through uniform energy dissipation. These recoil pads optimize internal pressure distribution for a 35% increase in protection due to uniform energy dissipation. The pad is made of all-weather, nonslip Navcom material to reduce noise and vibration. It also reduces muzzle jump for faster target reacquisition. The Sims Limbsaver AirTech Slip-On Recoil Pad slips over existing firearm stock without any modifications and works with or without factory recoil pad. Available: Small/Medium: 1/2 LOP 4-5/8X1-9/16 up to 5-1/8 x 1-3/4 Small: 1 LOP 4-1/2 x 1-1/2 up to 4-3/16 x 1-5/8 Medium: 1 LOP 4-13/16 x 1-5/8 up to 5-1/8 x 1-3/4 Large: 1 LOP 5-1/8 x 1-3/4 up to 5-3/8 x 1-7/8 Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Recoil Pads.