This is an optional Traxxas Aluminum Center Driveshaft in Green.
Traxxas designed this one-piece driveshaft out of tough 6061-T6 aluminum to be both strong and lightweight. Internal splines fit directly onto the input shafts of the front and rear drive assemblies to eliminate driveline play. The vivid anodized finish features a laser-etched Traxxas logo for extra style. (Requires TRA6888X drive hub if upgrading from composite driveshaft)