This is the Team Integy Blue Evolution 4 Wheelie Bar for the Traxxas E-Maxx and all versions of the T-Maxx. Goes on the back of the truck and prevents it from flipping backwards. FEATURES: Silver in color Aluminum construction Rubber wheel Very durable INCLUDES: Wheelie Bar w/wheel REQUIRES: Installation SPECS: Length: 7.25" (184.15mm) Width: 2" (50.8mm) (At widest part) Wheel Diameter: 1.57" (40mm) COMMENTS: Also available in blue (INTC9494) lmm 12.3.09 ir/jxs