Gear differential precision inside gears produced from 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 stability of hardness, toughness, and freedom to make stamina, minimal use, and minimizing breakage or teeth stripping. The graphite gears are lighter leading to increased drivetrain effectiveness. A must have for expert racers. Fits T4.