Aluminum Ball Differential for FF03 is with special designed D shape pit for holding the differential plate, it is capable to minimize the chance of spinning that already provened by thousands tests in laboratory. Made of 7075 Aluminum with surface hard coating which is stiff, durable and resistant to damage. It is first time to use 2.6mm screws and 2.6mm thrust ball bearing, which is capable to reduce the chance to break off and to optimize car performance. The loading capacity of this part is higher than the traditional 2.0mm screws. Come with 2.6T nut that made of alloy steel.