Product: Package: Instruction: Specification: ●Use for T-REX 550E/600/600 Nitro。 ●Front drive gear assembly x 3●Front umbrella gear-20T x 3(Φ21.2x33.6mm)●尾傳動導輪傘型齒-20T x 3(Φ21.2x12.5mm)●Pin x 3(Φ1.5x8.8mm)