Gear differential accuracy internal gears produced from brand new graphite composite mixture. Includes 2 bevel gears and 4 satellite gears. Molded through the all-new unique lightweight and extra-strong graphite material which provides the gears an optimum stability of hardness, toughness, and flexibility to offer endurance, minimal use, and minimizing breakage or teeth stripping. The graphite gears are lighter which leads to increased drivetrain effectiveness. A must have for professional racers. Fits T4.