D.I.D.'s professional high-performance non O-ring chain.DHA pin treatment - hard chromium-carbide layer formed on pin surface.Far better wear resistance than other chains.Up to 19% higher tensile strength.Increased anti-oxidation performance.Solid bushings, quad-riveted pins.Super NON O-RING.D.I.DSUPER NON O-RING 428NZG-120 CHAIN (GOLD).120 Links.GOLD.Super Non O-Ring.SDH treatment on pins.Quad-riveted pins.Solid bushing.

Highest quality of non O-ring chain in overall combined performance|Average tensile strength of 5,740 lbs.

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