We started making headsets in 1976 and have been refining them ever since. Our DropSet™ 6 is built to be precise and dependable, setting the standard for quality integrated headset function, and delivering precision performance that is built on the same pedigree of Chris King headsets over the past 40 years. Be sure to determine proper fitment to your frame before ordering. If you have any questions regarding proper fitment, please visit your local King dealer or contact customer service at info@chrisking.com. Engineered, manufactured, and assembled in Portland, Oregon, USA King Lifetime Warranty Legendary made-in-house bearings Patented GripLock® retention design for dependable headset adjustment ( US Patent 8662517) 41mm 45x45 upper and lower bearing Compatible with our included baseplate and 45-degree integrated crown races IS41|28.6 45/45, IS41|28.6 45/45