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Our 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 ⅞" 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 (w/ std. bearing insert) Inserts for other handlebar brands available separately