This product is a set of 4 CNC turned black anodized aluminum tire valve stem caps in a bullet shape. These valve caps are made of durable aluminum material with a thread direction of clockwise. They have a universal fitment for both vehicle and bike tire valve stems. The valve caps are black anodized aluminum finished and feature a dustproof design, requiring no tools for installation. The outer diameter of the valve caps is 10mm and the inside diameter is 7mm, with a length of 1.25 inches.