Redcat Racing 12mm Purple Aluminum Wheel Hex (4 Piece) Aluminum Wheel Hex (4pcs)(12mm)(purple) Genuine Redcat Racing Hop Ups, Spare Parts Redcat Racing Part Number 02134 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.