This a pair of replacement Exhaust Manifold Springs for the Tower Hobbies Tower Terror Monster Truck FEATURES: Steel construction, black in color Replaces worn or damaged manifold springs INCLUDES: Two Exhaust Manifold Springs - key number 90 REQUIRES: Installation SPECS: Length: 3.5" (89mm) Diameter: .20" (5mm) Wire Diameter: .027" (.70mm) COMMENTS: For the manifold order TOWC7470 kpm01/22/2007 ir/jxs