Redcat Racing Blue Aluminum Hop-Up Kit for the Tornado EPX and EPX Pro models.Includes the following Aluminum parts: Steering Knuckles (02131), Turnbuckleswith machined rod ends (2 of 06048B), Rear Hub Carriers (02130b), Rear LowerSuspension Arms (06049b), Front Hub Carriers (02132b), and Front Lower Arms(06050). All necessary hardware included.