Gear differential accuracy inside gears made out of new graphite composite combination. Includes 2 bevel gears and 4 satellite gears. Molded from all-new unique lightweight and extra-strong graphite product provides the gears an optimum security of hardness, toughness, and freedom generate stamina, minimal usage, and minimizing breakage or teeth stripping. The graphite gears are lighter leading to increased drivetrain effectiveness. A must have for expert racers. Fits T4.