Xpert RC Gear Set with bearing

Xpert RC Gear Set with bearing Replacement Xpert RC Gear Set: Suitable for: SI-4531 SI-4601 SI-4701 SN-4501 SN-4601 SM-4501 SM-4601 SI-4601-HV SI-4502-HV SN-4601-HV SN-5501-HV SM-5501-HV SM-4601-HV SM-5501-HV SM-6601-HV