NEW self protection Less lethal rounds .68 cal 3.5 Grams each ball These projectiles are extremely dense injection -molded Nylon rounds designed for maxim impact and distance. Please use riot balls responsibly The new .68 Cal Nylon Riot Training Balls are the latest non-lethal training munitions available today. The .68 Cal Riot 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! Self Defense Paintball Ammo Alternative New and improved hard Nylon balls 3.5 grams, about 17mm or .68 These work great and are intended for practice target shooting and possible home defense against intruders or animal attacks. They work in all .68 cal. paintball guns, They are reusable, do not deform and long lasting