Full metal body and sideplate keep precise gear alignment under heavy loads. Superline Spool?, no backing needed because of the rubber gasket keeps superline from slipping. Machine and anodized aluminum spool. HT-100? drag washers provide smooth drag under heavy loads. Stainless steel main shaft. 6 Sealed stainless steel ball bearings. Infinite anti-reverse. Techno-balanced? rotor gives smooth retrieves. Machined and anodized aluminum handle with soft touch knob.