2Pcs 3.17mm 11T 12T 13T 14T Motor Pinion Gear Modulus: 0.5 For Trex T-Rex 450 Helicopter

2Pcs 3.17mm 11T 12T 13T 14T Motor Pinion Gear Modulus: 0.5 For Trex T-Rex 450 Helicopter

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