Product: Package: Instruction: Specification: ●Use for T-REX 500. ●Front drive gear assembly x 1(Φ4xΦ4.7x42mm)●Front long umbrella gear-25T x 1(Φ18.5xΦ8x25.4mm)●Front short umbrella gear-25T x 1(Φ18.5xΦ6.5x11.8mm)●Pin x 1(Φ1.5x6.8mm)