Direct O.E.M. replacement, but with high-quality billet aluminum instead of cheap plastic. Inside the Pro Taper aluminum throttle tube is Teflon-coated to reduce friction between the tube and your handlebar. A knurled finish provides a solid bond between tube and grip. Precision CNC machined. Significantly stronger than stock plastic throttle tubes. Teflon™ inner coating to reduce friction. Knurled finish ensures solid grip bond.