Hollow-Point Gear Silver Bullet Bicycle Tire Valve Caps - Real .40 Caliber Bullet Tire Caps for Bicycles and Motorcycles. Set of 2 in Silver Bike valve caps made with once-fired .40 caliber bullets Protects the valve stem from dirt, dust, and corrosion Set of 2 bullet tire caps Add a tactical touch to your bicycle or motorcycle A portion of profits benefits the Navy SEAL Foundation