608 8*22*7 Hybrid Ceramic Bearing, specially designed for inline skates (freestyle skates, speed skates, casual inline skates). Adopting Si3N4 silicon nitride ceramic balls and SUJ2 high-carbon steel inner ring, ABEC-9 high precision, high speed, quiet, wear-resistant, waterproof and dustproof. Suitable for 8mm inline skate axles, greatly improving sliding fluency and extending service life. A must-have accessory for roller skate enthusiasts, compatible with skateboards and活力 boards.