Material: Presta valve cores are made of zinc alloy with a high-quality finish. Waterproof and rust-resistant, they offer a long lifespan. Practical tool: These bicycle valve cores are small and practical. They replace old valve caps, prevent air from entering worn valves, are oil-resistant, and ensure a perfect seal. Easily take them with you on your bike rides; they take up minimal space. This allows you to cycle with peace of mind and comfort, without worrying about your tires. Easy to use: This valve core kit is easy to install and use. Just use a wrench or valve core remover to screw the Presta core into one end and the Schrader core into the other. Installation takes only a few minutes and requires no additional tools. Wide compatibility: Our valve core kit is compatible with Schrader/Presta/Presta Extender valves and tubes found on bicycles, motorcycles, and cars. Important accessory: The valve core is an important accessory for bicycle tires. It prevents air leakage and ensures proper bicycle function. Durable, safe, and reliable, it allows you to cycle with peace of mind. If your valve breaks, it is important to have spare parts to avoid accidents.