Set of 4 pcs Custom Silver Grenade Design Aluminium Tire Tyre Air Valve Dust Cap Cover Protective Kit for Mountain Bike MTB Bicycle BMX Heavy duty Aluminium housing for perfect durability Cool custom grenade style design, Compact size Protective Car Tyre Valve Caps, help prevent leakage, dirt and other objects from damaging cores. Solid and durable. Easy to install, just screws onto tire valve stem tightly. Ideal for motorcycles, cars, vans ,bicycles etc.