This is a Robinson Racing Extra Hard Steel 5mm Bore .8 Mod, 21 Tooth Pinion Gear. These pinions fit brushless motors with a 5mm shaft and are intended for use with the Traxxas E-Maxx model #3905. These will also work with standard size brushless motors when used with the RRP1200 reducer sleeve, making them an excellent choice for the Traxxas Slash 4x4.
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