T4E .50 Caliber Reusable Rubber Balls 10 Count, Black - Tophatter's Guns'N'Weapons StoreBe Prepared to Protect. Practice and familiarize yourself with your . 50 Caliber pepper pistol by using these rubber balls before ever loading pepper rounds in your less than lethal self defense pistol from T4E and Umarex. Features: Dense rubber construction Specifically made for the T4E . 50 caliber line of training guns and pistols Precision made for improved accuracy, functionality, and reliability 100% reusable