Aluminum Valve Cap: The hexagon tire caps are made of high quality aluminium alloy,durable and well constructed, shows beautiful color after electroplating. The surface of the valve caps are processed with frosted technology, reduce product burr and provide comfort grip feel ultimately.High Protection Performance: Provides a nice tight moisture and air seal for your valve stems, seals dust out of the valve stem top, protects the valve from damage, rust, and corrosion, prevent tire from air leakage well, extend your valve stem life.Built-in Sealing Ring: These valve caps with red rubber O-ring gasket inside provides a nice tight moisture and air seal for your valve stems. It can be threaded easily onto the valve stem by hand.Tip: Metal on metal in hot conditions with the added joys of road dirt, salt grit, rain, mud etc will corrode. If you want to use these valve caps make sure to use some corrosion resistant grease liberally on the valve (take care not to get into the valve) and a little on the valve cap. Once youve put on the new valve cap twist it on and off a few times to make sure grease is well applied. Repeat this every three months or so.Widely Use: Designed to fit for cars, carts, trailers bikes,motorcycles electric bikes,trucks and a bicycles. Widely used in car repair shops and cap replacement for home vehicle tire.Against exposure to dirt, grime and dust.Work Well: You can screw on all the way to the bottom of the valve, no more worried if your tire caps would fall off like others, grip on your valve stem firmly, good for a long and tough drive. Package: 8 PCS Black Aluminium Alloy Tire Valve Stem Caps. Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.