Traxxas chassis for the Revo 2.5 is constructed of 6061 T-6 aluminum, anodized blue in color 1.2" (30mm) longer than Revo 2.5 chassis INCLUDES: Chassis for the Traxxas Revo 3.3.If converting a 2.5 Revo to this extended length chassis, the following parts are required, Steering Linkage REVO 3.3. Center Half Shafts. Revo Chassis Brace