Premium Material: valve caps are made of durable aluminum alloy, anodized finished, good anti-corrosion and dirt proof for your bike. They are wear-resistant and not easy to break.Size: about 17 mm x 6 mm / 0.67 x 0.24 inch. Bright Color: Each bicycle dust cap size about 17 x 6 mm. Stylish shaped and colorful valve caps make your bike more more attractive and special. Package Includes 25 pcs bike tire valve covers. Easy to Install: Lightweight, no tools required. These metal presta valve stem caps with mesh threads on the surface, it is easier to grab and tighten it with your fingers on the fly. You can replace it anytime, anywhere. Protect Funciton: These valve caps for bicycle tires are helpful to protect your valve core from destruction, dirt or dust. Save from fast air deflation. They can avoid mud, dirt and rainwater to extend the life of the bicycle tires. Wide Application: Made especially for bicycles. Suitable for the French air valve. Convenient for carrying and storing, can last for a long time use. Suitable for various types of bikes, such as mountain bike, folding bike, road bike and so on.