The G2 Jimmy Twister incorporates three bearings for the smoothest action possible. Two small roller bearings inside the handlebar allow a shaft connected to the throttle tube to spin friction free. A third thrust bearing located between the handlebar end and the inner end of the throttle tube prevents the throttle tube from jamming against the handlebar during a right side landing. The unique aluminum insert has a shape that is virtually impregnable to water. Best of all, the Jimmy Twister ball bearing throttle insert fits perfectly with all G2 Ergonomics throttles. Machined and anodized 6061 aluminum. Two (2) sealed internal roller bearings. Thrust washer bearing prevents handlebar / throttle tube jamming. Fits ALL aluminum handlebars and G2 T.C.S. throttle tubes (sold separately)! Easily installs in minutes! Note: Will NOT work with endure style aluminum handguards.