Wolf Tooth Performance IS52/40 Lower Headset A serious upgrade The Wolf Tooth Components Performance series headsets are built to last, with durable bearings and precision construction at a reasonable price. This Wolf Tooth Performance IS Headset is designed for bikes with an in-molded (IS, Integrated Standard) style of headset, bringing the high quality of a Wolf Tooth Performance Headset to bikes of all types. The Enduro black oxide-coated chromium steel cartridge bearing is a long-lasting bearing at an economical price, with a corrosion-resistant coating to improve bearing life. Features Pecision machined using aircraft-grade 6061 aluminum Enduro black oxide-coated chromium steel cartridge bearing for corrosion-resistant performance at an economical price Designed for bikes with IS (Integrated Standard) headsets for a performance upgrade from stock headsets Machined in the USA at Wolf Tooth Components' Minnesota facility1-year warranty through Wolf Tooth Components SPECIFICATIONSBearing Type Enduro Black Oxide Sealed Cartridge Integrated Standard (IS) frames with a 41mm upper and 52mm lower outer bearing diameter | Wolf Tooth Components | Is52/40 Lower Headset Is52/40