Description: In order to increase the quality and the performance of the motor, we now would like to introduce the Aluminum Pinion Gear set to you. One set four gears with different ratio(i.e. 15T, 17T, 19T & 21T) which would offer you more choices. You can just pick up any one according to the different location and different motor. Don't hestitate anymore~ Come and get one now~
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