Description: Material: Bearing Steel / Carbon Steel Model: 608 zz(ABEC-7) Inner diameter: Approx 8mm / 0.3 inch Outer diameter: Approx 22mm / 0.8 inch Height: Approx 7cm / 0.3 inch Quantity: 10 pieces Color: Silver High rotation speed, durable and long lasting. Anti deform under heavy loads Double-sided , with good dust prevention effect Widely used in the drift plate, skateboard, machinery, electric tools, models, electric cars, scooters, etc Package Includes: 10 x Skate Bearings