High-quality materials: Presta valve cores are made of durable copper, finely machined, waterproof, rust-resistant and with long service life. All parts are high quality and durable for rugged use to protect your bike's valves and cores from dust, dirt and other debris. Practical Tool - Bike valve core accessories are small and handy. It replaces leakage from old valves, stops the air from old valves, is compatible with oil and provides good air tightness. You can easily take them on any trip, won't take up too much space. So you don't have to worry about your bike tires anymore and you can ride with ease and comfort. Easy to use: This bike valve replacement is easy to install and use. Just use a wrench or valve removal tool to screw in the Presta valve stem, one end for the Presta valve core and the small end for the Schrader valve core. All installation steps can be done without using other tools, only takes a few minutes. Wide range of use: Our bicycle valve core set is suitable for Schrader/Presta/Presta Extender/tube valve tools such as bicycles, motorcycles and cars. In addition, the kit includes 1 x valve removal tool, 10 x Presta valve cores, which can meet your daily needs, you don't need to worry about choosing tools. Important accessory: The valve core is an important accessory for bicycle tires that prevents air leakage and ensures normal bicycle use . Durable, safe and reliable. When the bicycle valve cover fails, it is very necessary to have spare parts on hand so that you don't have to worry about accidents.