The 6806 CC BO is an Angular Contact Bearing for Internal Headset, created by Enduro Bearings. It features a durable Black Oxide/Magnetite coating on its 52100 High-Carbon Chromium alloy races, along with grade 10 Balls. Our Enduro line of headset bearings starts with chromium steel, complemented by a Black Oxide finish A/C type, and also offers the option of full 440C stainless steel for the highest quality. No matter which option you choose, our bearings are designed with the largest balls possible and are equipped with dual lip seals in a micro groove, providing the utmost protection against sweat and the elements. We fill our bearings with 90% high pressure waterproof grease, so you never have to worry about whether they are properly lubricated. Angular Contact (A/C) bearings engage all of the balls, distributing the force over a larger surface area, resulting in reduced friction and minimal wear.Bearing Code: 6806 CC BODimensions: 37 x 49 x 6.5mmABEC: 3Grade: 10Seals: LLBGrease: Kyodo Yushi PS-2Application: HeadsetsWeight: 25.25g