Hollow-Point Gear Bullet Tire Caps - Brass Bullet Valve Caps. Real Fired Bullet Casings - Car, Truck, ATV Replacement Tire Valve Caps. Gun Lover Gift. Handmade in the USA using recycled brass bullet casings Large, .40 caliber tire caps, sold in sets of 4 Bullet casings provide maximum ballistic durability Add a tactical touch to your motorcycle, car, or bicycle. Fits all standard size tire valve stems! A portion of profits benefits the Navy SEAL Foundation