4x Skull/Bones Black Tire Wheel Valve Stem Air Caps Metal Covers Car/Motorcycle (4) Skull/Bones Black Tire Wheel Valve Stem Air Caps Metal Covers Car/Motorcycle Universal fit for all vehicles, bikes, motorcycles, golf carts, and more. Color: Black Material: Plastic Line the inside with a soap bar to prevent corrosion and the inability to remove them when needed.