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✓The 520SO is one of the best O-ring chains in the industry
✓520SO chains feature heat treated hi-carbon alloy steel components with seamless rollers and shouldered bushings for strength and durability, and are fitted with O-ring seals
✓O-ring seals are made from an advanced Nitrile Butadiene composite for maximum performance and wear life
✓Nitrile Butadiene O-rings seal in lubrication and deliver smooth power with no O-ring drag or loss of horsepower
✓The 520SO has a tensile strength rating of 7700 foot pounds and is rated for bikes up to 400cc