Features The ceramic rolling bearing is suitable to work in harsh condition of corrosive fluids, because ceramic is almost not afraid of corrosion. Due to the lower density of ceramic rolling balls and much lighter weight than steel, the centrifugal effect to external race can be reduced by 40% when rotating, thus greatly extend the service life. The ceramic is less affected by thermal expansion than steel, therefore, when bearing clearance is certain, it can work in a environment where temperature changes more severely. The elastic modulus of ceramic is higher than steel, so ceramic is not easy to deform under stress, which can improve work speed, and achieve a higher precision. Widely used for medical and instruments, cryogenic engineering, optical instrument, high-speed machines, high-speed electric machinery, printing machinery, food processing machinery, aviation, spaceflight, navigation. Specification: Model: 6804 Inside Diameter: 20mm / 0.8in Outer Diameter: 32mm / 1.3in Thickness: 7mm / 0.3in Color: White Type: 6804 full ceramic bearing Material: Zirconia ceramics Rolling Elements Row: Single row Race Type: Deep groove race Weight: 17g / 0.6oz (approx.) Package list: 1 * Bearing Package List