Durable: This bicycle valve is made of high quality aluminum alloy and closely matched with rubber O-ring, which can effectively prevent leakage. Product design: lightweight, portable, easy to install, adapter Presta to Schrader, just loosen the end of the Presta valve, then screw the valve adapter, which can help you improve efficiency and inflate your bike at any time. Extensive use: these valve stem adapters are suitable for bicycles, road bikes, folding bikes and most mountain bikes. They are very easy to inflate. Enjoy your cycling trip with our accessories. Contents: 10 Presta to Schwadr valve adapters, which will meet your needs perfectly. Multi-function adaptor: The bicycle valve can be converted from Presta to Schwader, which can be used to inflate tires with various standard air pumps or compressors.