This recoil and vibration reduction device works effectively on most hard surfaces and helps prevent bipod "sinking" on soft soil or sand. It features a double Velcro closure to securely hold weighted media and is constructed from durable 1000D nylon. Available in two sizes: Small (Tan) and Large (Black). Key Features Helps reduce recoil and vibration during firing Works well on most hard surfaces Helps prevent bipod "sinking" on soft soil or sand Double Velcro closure secure weighted media 1000D nylon construction 2 sizes – Small (Tan) and Large (Black) Dimensions: Large - 24" x 8“ Small - 16" x "8