High precision metal wire cup, large capacity, chamfered design, smooth wire output, CNC metal rocker arm, sturdy and sensitive, with thick main bearing inside, enhanced power, sturdy and durable, high smoothness wire wheel, no damage to wires and no jamming, thick wire polishing ring, small resistance and farther throwing, EVA anti slip grip, comfortable grip, preventing sweating and slipping, strengthening the main body, stable and non shaking.