This is the Traxxas 25-Tooth Pinion Gear, 32-Pitch, 3mm Bore [10842]

25-tooth pinion gear (32-pitch) fits 3 mm motor shafts and includes set screw. Traxxas pinion gears let you fine-tune the performance of your Traxxas model. Changing gear ratios can help balance acceleration and top speed for different running conditions. Please consult your owner’s manual for more information on recommended gearing options for your specific model.

Compatibility:

• Mini XRT VXL-3s