Chris King started making headsets in 1976 and have been refining them ever since. Our DropSet(TM) 3 is built to be precise and dependable and sets the standard for quality integrated headset function delivering precision performance that is built on the same pedigree of Chris King headsets from the past 40 years. Compatible with Santa Cruz, Yeti, Alchemy, Santa Cruz Stigmata (without baseplate), Ibis Hakka MX, and more. Engineered, manufactured and assembled in Portland, Oregon USA King Lifetime Warranty Legendary made-in-house bearings Patented GripLockA(R) retention design for dependable headset adjustment (US Patent 8662517) 41mm 45x45 upper bearing 52mm 36x45 lower bearing Compatible with the included baseplate and 36 degree integrated crown races