ProTaper Handlebar PT Twister Throttle Tube Features - Precision CNC machined. - Sealed radial ball bearing virtually eliminates friction. - Plastic end plug keeps debris out. - Knurled finish ensures a solid grip bond. - Compatible with all ProTaper bars and Renthal 7/8" models (w/ std. bearing insert) - Inserts for other handlebar brands available separately. What's in the box 1 x ProTaper Handlebar PT Twister Throttle Tube.