Product description：
Application.
Fits PRESTA/FRENCH valve stems only. !!Not suitable for car valves.
Lightweight
Make your riding easier ,Faster and save energy .
Not be corroded
Not be rusted or be oxidized as aluminum alloy, can be used in any weather .
Easy to install and remove, no need any extra tools
Product detail：
Name: Presta Tire Valve Caps
Material: Plastic
Color: Black
Package: 20 pcs/package
Package Dimensions: H-2.76*W-3.94*Thickness-0.35 Inches
Shipping Weight: 0.31 ounces
Q&A:
Why should we buy tire valve caps?
Tire valve caps help seal the air and block road dust and dirt for sealing and prevent tire leakage, and ensure tire pressure is stable, ensuring safe riding. 
2.Why we choose plastic tire valve caps?
Will not corrode the valve stems like metal caps.Light weight will save your save energy,Make your riding easierand faster. Most original bikes are equipped with plastic valve caps.