The Tamiya Pinion Gear Set 22T/23T is a set of RC Parts. They are 48 pitch metric 22 tooth and 23 tooth gears. The number of teeth is stamped on the pinion so they cannot be confused which is which. They are made of aluminum. Includes One 22T pinion gear (48 Pitch) One 23T pinion gear (48 Pitch) Two Grub Screws Manufacturer: Tamiya Model: 50357 Pinion Gear Set 22T/23T 48 Pitch