This Retro Arms Shim Set comes with twenty 1mm gearbox shims that allow you to shim your gearbox to perfection. We highly recommend watching videos on how to accomplish proper shimming, however, please be aware that there are many techniques to do so. It may take some practice to get proper shimming down, but once you do, it makes a HUGE difference on how your AEG performs and lasts.
Shim thickness: 1mm
Amount of shims: 20 Per Pack