Miniature ball bearing is available ball bearing of small size. This miniature has a 8mm inner diameter, a 22mm outer diameter and a 7mm thickness. Ball bearing of this size is great for precision work and applications that require a lot of functional mechanical parts, such as mechanical equipment, electrical instrument, toy, door and window. This miniature bearing is made of high quality zirconium dioxide ceramic for low noise and long service life. Ceramic bearing is impervious to corrosion and rarely require lubrication. size:8mm*22mm*7mm Material:ceramics colour:white Package Contents: 1 * Bearing Only the above package content, other products are not included. Note: Light 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.