Embiofuels(TM) 4pcs/pack motorcycle bicycle wheel tire valve cap Theftproof Aluminum Car Wheel Tire Valves Tyre Stem Air Caps[ Black ]. Made of high quality chrome Aluminum. Lightweight and unique design, durable, anti-rust. Best replacement for the old valve caps. Prevent dirt and water get into the inside of valves and potentially. Jamming or contaminating the selling surfaces and causing a leak.