Upgrade your tires and keep them reliably inflated with the help of these Slime Black Barrel Replacement Valve Stem Caps. They are constructed of anodized aluminum offering a durable and long-lasting alternative to plastic caps. Their threaded connections fit onto the stems of most tires for a quick and easy exchange. Knurled bands provide a rugged texture for a secure non-slip grip when installing and removing. This pack of four tire stem caps is also tire sensor safe and won t trigger the tire pressure dashboard alert light when put in place.