Astra Depot 2x Chrome Silvertoned Skull Tire Air Stem Valve Cap Cover Set For Motorcycle Harley Davidson Softail Sportster XL Dyna V-rod Help to prevent leakage, dirt and other objects from damaging cores. Give your vehicle a clean and cool style. Waterproof and dustproof. A skull shape can make your car look more attractive and special. Direct Replacement, No Modification needed.