Features:-Professional Material: The presta valve cores are made of durable copper, finely crafted, waterproof, rustproof, and with a long service life.-Wide Application: Our bike valve core set is suitable for most of bicycles, but it does not work on valves without removable cores.-Note: If you encounter any installation and product problems, please contact us in time, we will provide help at any time.Specification:-Material: Copper-Product Size: 6.7*5.2*1.2 cm-Product Weight: 35g-Product Color: SilverList of Packages:-1 x Valve Disassemble Tool-10 x Presta Valve CoresNotice: -Please allow slight measurement deviation due to manual measurement.-Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.