Umarex Elite Force .50cal T4E Ammo Rubber Balls, Black, 250 Count – 2292150
.50 caliber – fits T4E TR50 and Practice 2 Protect series pistols. Compatibility: T4E TR50 and. 50cal Practice 2 Protect pistols. 17.4 grain rubber ball ammo. Type: Training Ammo – Reusable. Grain Weight: 17.4 gr.