This is an orginal Flite part.
FTX CENTAUR PINION GEAR (21T) FTX10441
Arrma Pinion Gear 20T 0.5 MOD CNC 2.3mm Bore ARA311206
Arrma Pinion Gear 25T MOD 0.5 CNC 3.2mm Bore ARA-2176
Arrma Pinion Gear 24T MOD 0.5 CNC 3.2mm Bore ARA-2175
Arrma Pinion Gear 16T MOD 0.5 CNC 3.2mm Bore ARA-2028
Arrma Pinion Gear 26T MOD 0.5 CNC 3.2mm Bore ARA-2177