This is a bone shaped sand sock taken to the next level. The bones design was the result of input from over a dozen Military Snipers, Police Marksman and Match Shooters. The Bone can be used in several different configurations and has an ingenious filler neck so the Bones volume can be tailored to the individual shooters needs. Badger Bones come filled with stable nonabsorbent material for years of service. Weight: approx: 7.8 oz.