These are original Tamiya parts i run 3s on them and they dont wear down or anything theyre good products Tamiya knows what theyre doing. If you have a tamiya vehicle and still want to keep it original yes i recommend but if u wanna go all out then you already know u shouldnt. Other than that yes theyre good!
It doesn't seem to say anywhere in the listing or description...... but these gears are made from FRP (Fiberglass Reinforced Plastic).
They feel solid, and working well - and QUIETER!
Highly recommended.