Product: Package: Instruction: Specification: ●Use for T-REX 500 ●Shaft x 1(Φ4xΦ4.8x42mm)●Tail drive gear(31T) x 1(Φ4.2xΦ19.8x9mm)●Metal pulley cover x 1(Φ4.4xΦ14.5x4.5mm)●Drive pulley(19T) x 1(Φ4.4xΦ6xΦ11.75x4.15mm)●Bearing 684ZZ x 2(Φ4xΦ9x4mm)