This is an Arrma BLX 4x4 15T 0.8mod Pinion Gear, intended fro use with BLX 4x4 BigRock, Granite, Senton and Typhon kits.
 
Features:
Precisely manufactured gear teeth
Strong set-screw 
Formed with the tooth count molded into the pinion boss for easy size recognition
Includes:
(1) Pinion Gear (15T 0.8MOD)
(1) M4 x 4mm Set Screw
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