Traxxas Hex Wheel Hubs/Pins T-Maxx (2) Set of Hex Wheel Hubs for the Traxxas T-Maxx 4WD RTR Monster Truck. These wheel hubs fit on the end of the stub axles. Replaces missing or damaged hex wheel hubs. Hubs are made of molded black plastic. Axle pins are steel. INCLUDED: Two Hex Wheel Hubs. Two 2.5x12mm axle pins.