1、Manufacturing Material: Made of high quality aluminum alloy and rubber materials, it is strong and durable, which undoubtedly extends its service life. 2、Quenching and Oxidation Processing: Quenching processing, surface anodic oxidation treatment, it is wear resistant, not easy to rust, and has high gloss. 3、Built in Rubber Sealing Ring: Built in rubber sealing ring, easy and effortless pumping, can effectively avoid air leakage. 4、Special Air Nozzle Converter: Bicycle special air nozzle converter, presta valve to schrader valve converter. 5、Purpose: Installed on presta valve, it is convenient to use the schrader valve air cylinder to pump. Item Type: Mountain Bike Pump Adapter Weight: Approx.4g / 0.1oz Material: Aluminum Alloy + Rubber Sealing Ring Product Size: Approx.15 x 9.5mm / 0.6 x 0.4in Features: Built In Rubber Ring To Avoid Air Leakage Purpose: Installed On Presta Valve, It Is Convenient To Use The Schrader Valve Air Cylinder To Pump. 2 x Schrader Valve And Presta Valve Converter