Target gender: Boy This is a super differential gear that is fully compatible with high power Li-Po & brushless with 18 balls on the outside and 12 balls on the inside. By increasing the number of differential balls, brushless & Li-Po power is transmitted reliably, resulting in a smooth differential that does not slip even with a small amount of tightening. This provides smooth cornering with a direct feel that moves forward linearly in response to throttle operation, and excellent turning performance. A new shape that prevents the differential ball from spilling due to the hole shape. Ease of maintenance has also been improved. (From Discovery Japan Mall)