Pro Taper Twister Throttle TubeOur Twister Throttle Tube is constructed from premium quality anodized billet aluminum. The sealed radial ball bearing and polymer bushing provide smooth, consistent throttle twist action, while the surface knurling ensures a viselike grip bond. Using the standard bearing insert, Twister Throttle Tubes are compatible with all ProTaper handlebars, as well as Renthal ?" models. Precision CNC machined Sealed radial ball bearing virtually eliminates