This ball bearing is made of high quality ceramic ZrO2 and metal material, features high precision, high speed, and wear small.Small frictional resistance, low power consumption, high mechanical efficiency.With the characteristic of high stability, high reliabilityCast longer and fasterStandardization size, used for machinery manufacturing, equipment installation and maintenance.Brand newType: ceramic ball bearingInner races: ZrO2 (Zirconium Oxide) ceramicBalls: ZrO2 (Zirconium Oxide) ceramicAnti-magneticcolour:Silver + brownMaterial:Metal + ceramicsize:Inner diameter: approx.8mmOuter diameter: approx.22mmWidth: approx.7mmPackage Contents:3 * BearingsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.