100 x PREMIUM Quality RUBBER-STEEL Shells, D-Type Ammo for paintball guns and self defense pistols in 68 cal. Manufacturer's Certificate: These balls are mixed with %50 Rubber and %50 Steel Powder. Article Details: 100 hard mix rubber - steel balls for 68 caliber paintball and RAM weapons. These rubber balls are also ideal for slingshots. They are made of very strong rubber and mixed with steel powder. Due to the very high quality materials used in the production, the rubber steel balls are super precise and also significantly rounder than comparable balls. One box of Rubber-Steel Balls (100 pieces) in 68 cal. weighs 645 gr. (one single piece weighs around 6 grams) Very good shot and hit picture used on home defense pistols, weighs heavier than the standard rubber balls, will be dispatched at very high speed. During the impact the ball will receive a violent shock, which will deform it slightly (this is the reason why the balls should not be reused). The deformation is small and difficult to see with the naked eye, but present. The major advantage of this type of projectile is that, upon impact, it will cause very significant pain, but will have the advantage of not penetrating the skin, which will allow you to neutralize without injuring your attacker. You still have to aim because this type of projectile can do small damage, especially on furniture or electronic devices (such as a television, computer screen, etc.)