General description Brand new and high quality skateboard and scooter bearings made of steel. These bearings are economical and standard, providing less friction and high speed for optimal performance. Technical specifications Inner diameter: 8 mm Outer diameter: 22 mm Thickness: 7 mm Quantity: 40 pcs Other information Package includes: 4 x (40 pcs) bearings Note: Light reflection and different displays may cause the color of the item to differ slightly from the real thing. The measurement allowed error is +/- 1-3 cm.