Throttle by Wire, medium-compound materials provide excellent durability and comfort Full-waffle moto-pattern reduces vibration/provides improved grip in all conditions Heavily knurled base-pattern delivers solid traction and control Billet-aluminum clutch-side clamp ensures 100% slip-free security (eliminates the need for set-screws) T15 Torx bolts ensure extra-secure clamping for solid, twist-free mounting. Proudly made in the U.S.A.