Brand new and good quality miniature ball bearings Bearings are impregnated with grease Material: steel, metal Outer diameter: 22 mm Inner diameter: 8 mm / Thickness: 7 mm Color: silver + black Package contents: 100 ball bearings. Only the above package content, other products are not included. Note: Light shooting 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.