Experience superior performance with this precision-engineered 6806 2RS hybrid ceramic ball bearing. Featuring chrome steel rings and black ceramic (silicon nitride) balls, this bearing combines durability with exceptional smoothness. The 30mm inner diameter, 42mm outer diameter, and slim 7mm width make it ideal for high-speed bicycle applications where space is at a premium. Both sides are rubber-sealed (2RS) to keep debris out while retaining lubrication. The nylon cage ensures proper ball spacing and smooth operation. These bearings excel in demanding conditions, offering reduced friction, lighter weight, and outstanding wear resistance compared to traditional steel bearings. Pre-lubricated with grease and ready for installation, these bearings are perfect for applications requiring reliable, high-speed operation. The distinctive red seal provides easy identification and adds a professional finishing touch to this premium quality bearing.