Tubeless Valves feature a removable valve core for ease of sealant install, inflation or accommodation of valve extension courtesy of standard-type extenders. They have both an o-ring and a threaded washer to keep the rim scratch-free, and to keep the washer tight. A clog-resistance function is achieved by 1) oversizing the valve bore near the internal rim rubber seal, and 2) the machined extension of the valve past the seal . Made from Aluminum with anodize finish. 40mm length. Item Specifications: Length (mm): 40, Material: Aluminum, Valve Core: Removable, Valve: Presta Short 32-40mm, Defined Color: Purple,