This is a pair of 5.4 rate (pink) Shock Springs for the Traxxas Revo. FEATURES: Red in color (small pink square indicates spring type) Metal construction INCLUDES: 2 springs REQUIRES: Installation on the Revo SPECS: Length: 1-11/16" (43mm) Inside diameter: 11/16" (17mm) Outside diameter: 7/8" (22mm) Spring Rate: 5.9