The new .68 caliber black rubber training balls for Law Enforcement and Military operators. These are the latest non-lethal training munitions available today. The .68 caliber rubber training balls are extremely cost effective, and can be used thousands of times. They just need to be swept up, rinsed, dried and put back in action! .68 caliber single color rubber reusable training balls. These are the best rubber balls in the market today! Compatible with Salt Self Defense Gun, and .68 cal Paintball Gun.