ODI calls it their 'Fusion Alloy Throttle tube'. When you require a new throttle sleeve, for instance when replacing the handlebar grips, this one can be used as a direct quality replacement for the original sleeve. Manufactured from heat treated 6061 aluminum with a black hard anodized finish. The super slick PTFE internal sleeve guarantees a virtually friction-free operating throttle. Outside Diameter: 1.125" (28.6mm) designed to fit 1" O.D. Handlebars.