•Use for T-REX 250. •Newly designed main gear mount to simplify gear replacement, and improve overall aesthetics of main gear system. | •New main drive gear(120T) x 2 •Main gear case x 1 •Bearing 683 x 1(F3xF7x2mm) •One-way bearing HF0306 x 1(F3xF6.5x6mm) •Cross screw x 4(T1.5x4mm) •Space x 1(F3xF4.8x0.5mm) |