1Iron cover seal, small friction resistance, fast heat dissipation, high temperature resistance, fast RPM. 2Bearing with cover, metal sealing, dust-proof, anti - liquid foreign object, quiet working effect. 3Suitable for high speed and high temperature equipment, easy to use without maintenance. 4Ball bearing 6905, wonderful replacement for the old or broken one. 5Easy and convenient to install, directly fitment for mobility scooter.
