Brand new and high quality Made of steel Widespread, economical and standard bearing. Easy installation and replacement Less friction, high speed, & Insulation Size: Inner diameter: 8mm Outer diameter: 22mm Thickness: 7mm Quantity: 40 pcs Package includes: 4 x (40pcs) bearings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.