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| ●Use for T-REX 550E PRO. ●Brand new M1 motor helical pinion with Stainless steel material. This high strength and high rigidity characteristics can help to increase wear resistance and longevity. ●Must with 550E PRO Motor Mount(H55B002XXW)、550E PRO Carbon Fiber Main Frame-2.0mm(H55B003XXW)、730MX Brushless Motor(850KV)(HML73M01) | ●Motor Pinion Helical Gear 16T x 1 ●M4 set screw x 2(M4x4mm) |
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