●Use for T-REX 500.

Specification:
●Metal drive pulley(19T) x 1(Φ4.4xΦ6xΦ11.75x4.15mm)
●Metal pulley cover x 2(Φ4.4xΦ14.5x4.5mm)
●Tail rotor shaft x (Φ4x56.8mm)