Used - Still works like new. Taken off of a 2018 RMZ450. Compatible with all Pro Taper bars and Renthal 7/8" models (w/ std. bearing insert) The Pro Taper Twister Throttle Tube is constructed from premium-quality anodized billet aluminum. The sealed radial ball bearing and polymer bushing provide smooth, consistent throttle response, while the surface knurling ensures a vise like grip bond. Using the standard bearing insert, Twister Throttle Tubes are compatible with all Pro Taper handlebars, as well as Renthal ⅞" models. Features: Precision CNC machined Sealed radial ball bearing virtually eliminates friction Plastic end plug keeps debris out Knurled finish ensures solid grip bond