Waterwood 4 Pcs Set Aluminum Tire Wheel Stem Air Valve Caps for Car Truck Bike - Red Made of high quality chrome Aluminum. Easy install, only screws onto tire valve stem. It only fits Schrader valve, does not fit other valve. Aluminum tire valve stem caps are made for custom fashion and security purpose. Can replace the original bad valve cap of the tyre and also show the beauty characteristic of the tyre.