Hobbypower HSP 11184 & 11181 Differential Metal Main Gear 64t Motor Gear 21t 94111 9417 HSP 11184 & 11181 Differential Metal Main Gear 64T Motor Gear 21T Fit for HSP 94103(PRO), 94107(PRO), 94111(PRO), 94123(PRO), 94170(PRO)