Redcat Racing RS10 Steel Gear Set with 10T Pinion, 4 Gears (1-Set Needed for Each Axle) RS10 Steel Gear Set with 10T Pinion; (4 Gears as Pictured) (1 Set needed for each axle) RC Car Parts : RCT-H106 Genuine Redcat Racing Parts 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.