These are the Replacement Exhaust Manifold Springs for the HPI Savage. FEATURES: Black Steel Manifold Springs. YOU WILL RECEIVE: Two Springs. REQUIREMENTS: HPI Savage. SPECIFICATIONS: Length: 91 mm (3.58") Spring Diameter: 3.2 mm (0.1258") Wire Diameter: 0.7 mm (0.0275") COMMENTS: None. jmm 11/13/02 ir/kh &