●Tubeless Valve StemsANODIZED ALUMINUM: The tubeless valve stems are made of lightweight anodized aluminum, which is wear resistant and durable, fits most mountain bikes and road bikes ●LIGHT AND COMPACT: Not easy to rust, and the vacuum extension tubeless valve has a soft rubber base to easily create an airtight sealing on the valve hole, with 40mm length.Bicycles and spare parts ●Bicycles and spare partsREMOVABLE COVERS: The bike tubeless valve stems feature removable valve covers, O rings and locknuts for bike repair replacement parts needs.