Redcat Racing Aluminum Hop Up Kit for Blackout XT,XB,SC (Front or Rear) Redcat Racing Aluminum Hop Up Kit for Blackout XT,XB,SC, Front or Rear Genuine Redcat Racing Spare Parts Redcat Racing Part Number BLH-0010GM 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.