Gear differential precision inside gears produced from brand 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 to create 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.