Manufactured from HIGH DENSITY, VULCANIZED RECYCLED rubber material, the BulletStop bullet encapsulation block is designed to stop bullet penetration (i.e., similar to a bullet trap) into infrastructure, ricochet, shrapnel "back splatter" and "bounce back" from rounds fired at close range. Each block measures 8"x8"x16" (the same size as a standard concrete block) and weighs 41 lbs. for easy handling. BulletStop ballistic blocks are capable of stopping and encapsulating both low velocity and high velocity (i.e., 9mm, .357, .45, .308, 5.56, etc.) ammunition.