This is a set of Red Shock Springs for the HPI Hellfire, HPIC1050. FEATURES: Constructed of steel, black in color Color relating to spring rate is painted on end YOU WILL RECEIVE: Two Red Shock Springs for the HPI Hellfire with spring rate chart REQUIREMENTS: Installing over shock body SPECIFICATIONS: length: 3.1" (80mm) diameter: 0.71" (18mm) Number of Coils: 10.5 Spring Rate: 11 (196) medium firm COMMENTS: Other shocks in this series include; HPIC8649 86549 Shock Spring 12.5 Coil Blue (softest) HPIC2550 86550 Shock Spring 10.5 Coils Silver (medium soft) HPIC8651 86551 Shock Spring 14.5 Coil Pink (medium) HPIC2554 86554 Shock Spring Yellow (firm) HPIC8655 86555 Shock Spring 10.5 Coil Red (firmest)