Welcome to our store! 1. Manufacturing Material: Made of high-quality aluminum alloy and rubber, it is strong and durable, which will undoubtedly extend its service life. 2. Hardening and Oxidation Process: Hardening process, anodic oxidation on the surface, it is wear-resistant, not easy to rust, and has a high gloss finish. 3. Built-in Rubber Sealing Ring: Built-in rubber sealing ring, easy and effortless pumping, can effectively prevent air leaks. 4. Special Air Nozzle Converter: Special air nozzle converter for bicycles, Presta valve to Schrader valve converter. 5. Purpose: Installed on the Presta valve, it is convenient to use a Schrader valve air cylinder for pumping. Item Type: Mountain Bike Pump Adapter Weight: Approx. 4g / 0.1oz Material: Aluminum alloy + rubber sealing ring Product size: Approx. 15 x 9.5 mm / 0.6 x 0.4 inches. Features: Built-in rubber sealing ring to prevent air leaks. Use: Installs on Presta valves, making it easy to use Schrader valve air cylinders for pumping. Includes: 2 x Schrader valve and Presta valve converter. Customers are our priority. If you encounter any problems with your product after receiving it, such as damage or an incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.