Team Redcat Steel Bearing, 5 x 10 x 4 mm Redcat Racing 5x10x4mm Steel Bearing (4pcs) Genuine Redcat Racing Spare Parts Redcat Racing Part Number 150510ST For troubleshooting and warranty information please contact a Redcat Racing Customer Service Specialist at 602-454-6445 or by emailing amazonsupport@redcatracing.com NOTE: Please read the User Manual before use.