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Infinite Torque-Up Short Type engine made of stainless steel, polycarbonate and heat treatment and strong neodymium magnets by SHS. The bushing shaft is made of aluminum, bearings with inner ball bearings. Better activation response, better reliability and an improvement in the cadence (depending on the gear set used). It works on the Ak series and most of the V.3 and AEG gear that use short motors.