Description: Inert ABS plastic material helps caps screw on and off with ease. Rigorously tested to withstand salt spray and corrosion. No interference with Tire Pressure Monitoring System. Designed to be hand tightened. Set of 4. Improve the durability of your wheel valve stems by eliminating the seizing that can occur with metal valve stem threads. Valve Stem Caps - 4-Piece Set / INFINITI Logo.