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Specification: -Style: Rivet -Chain Size: 520HV -Color: Gold, O-Ring is Black -Size: As Picture Shown -Quantity: 2 pc Features: -High Quality Material -Easy Installation -Precise Forging process leads to a stiff chain for better acceleration and more efficient engine work. -Lightening hole allows for a lighter chain without compromising strength while removing mud and dispersing heat more efficiently. -Improvement in transmission efficiency. Special pin with holes in both ends allow the chain to be lightened. -Edge-cut inner plate reduces friction and allows for smooth engagement with sprocket.