Target gender: Boys A high-precision spur gear that can be installed on touring cars from various companies. Excellent gear accuracy!Our spur gears have excellent gear dimensional accuracy. In particular, the dimensional accuracy of the tooth thickness is important; if this dimension is positive (greater than the standard value), noise will occur when the gear meshes with the pinion, and drive efficiency will drop significantly. The thickness of the straddle teeth of our spur gears is negative for good efficiency, and the gears are extremely quiet and have excellent drive efficiency. In addition, film gate molding is used to achieve high roundness. Compatible with pin fastening, screw fastening, and differential ball! With a slight protrusion in the mounting hole, it is possible to install the spur gear on a 3mm pin fastening type car without any play. (Out of the 12 holes inside, 4 are optimized for 3mm pins. It can also be installed on Tamiya TRF417 without any play.) It is also possible to insert 1/8 size differential balls (12 in total) into these holes. . It can also be used as a differential gear for DD cars. The slight protrusion also serves to prevent the differential ball from falling off. (From Discovery Japan Mall)