ProTaper's Twister Throttle Tube is constructed from premium-quality anodized billet aluminium. The sealed radial ball bearing and polymer bushing provide smooth, consistent throttle twist action, while the surface knurling ensures a vice-like grip bond. Using the standard bearing insert, Twister Throttle Tubes are compatible with all ProTaper handlebars, as well as Renthal 7/8 Inch models. Precision CNC machined Sealed radial ball bearing virtually eliminates friction Plastic end plug keeps debris out Knurled finish ensures solid grip bond Compatible with all ProTaper bars and Renthal 7/8 models (with standard bearing insert) Inserts for other handlebar brands available separately