1.[DURABLE]This Bicycle Valve is Made of High Quality Brass and Closely Matched With Rubber O-Ring, Which Can Effectively Prevent Leakage. The Valve Cover Can Prevent it From Being Corroded By Muddy Water. 2.[PRODUCT DESIGN]Lightweight, Portable, Easy to Install, Presta to Schrader Adapter, Just Loosen The Tip of Presta Valve, and Then Screw on The Valve Adapter, Which Can Help you Improve Efficiency and Inflate your Bicycle at any Time. 3.[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 Bike Trip With our Accessories. 4. [YOU WILL GET]6PCS From Presta to Schvadr Valve Adapters, 12PCS Presta Valve Covers, Which Will Greatly Meet your Demand. 5.[MULTI-PURPOSE ADAPTER]The Bicycle Valve Can Be Converted Form Presta to Schwader, Which Can Be Used to Inflate Tires With Various Standard Pumps or air Compressors. Product description I wish all the bicycle lovers over the world can enjoy the happiness ,I am deeply honored. Colour:Gold + Black Material:metal + plastic Size:outer diameter 9.9mm, length about 12.7mm<br><br>Package Contents: 6 x Presta to Schrader valve adapters 12 x plastic Presta valve cover