UP Parts PowerGears are reinforced torque-up gears for Tokyo Marui compatible AEGs. This high-precision gear set is made out of heat-treated steel to withstand the stress of high powered springs. Compatible with all TM AEG gearboxes, with the exception of long gearboxes (e.g. PSG-1, SR-25). When completely equipped with UP Parts, the gearbox runs very smooth and with crisp response. Up Parts are made in Taiwan by brand producers, which made upgrade parts for Aim Top, Guarder and other world leading brands.