Package include: 10 pieces valve cores, enough for your bicycle, you can also share them with your family and friends, they are good bicycle necessities. Advantage: a small, handy tool, approx. 1 inch/ 2.6 cm long, it is taken to replace the leak of the old valve and make the tire rejuvenation, stop air leaks from old valves,l compatible and good air tightness, they are more durable, safe and reliable. Durable and sturdy: these valve cores is made of quality copper, enhance the corrosion resistance of the valve core and valve stem, especially when installing the valve core into an brass valve stem, more durable, safe and reliable. Fits for presta valve cores (French valve core) are mainly applied in bicycles,compatible with Stan's, , , , Bontrager, road and tubeless valve stem. Easy to install: use pliers or valve removal tool to screw onto valve stem, no longer need to worry about bicycle tires, so that you can ride your bicycle with ease and pleasure when outing trip or match with your friends. Colour:Silver Material:copper Size:Length: about 26mm Package Contents: 20*Valve Core Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.