100 x PREMIUM RUBBER-STEEL BALLS, PAINTBALLS (68 cal.) Article Details 100 hard mix rubber - steel balls for 68 caliber paintball and RAM weapons. This rubber-steel ball munition is also ideal for slingshots. They are made of very strong rubber and they are mixed with steel powder. Due to the very high quality, 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 ca. 750 gr. (one single piece weighs around 7 gr. due to the weight of the box). Very good shot and hit picture used on defense pistols. This projectile, weighs heavier than the standard rubber balls and they are 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 must in no case 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.)