Renthal C291 R3-2 O-Ring 520-Pitch 114-Links Chain Nitrile 'O' rings extend chain life by retaining special vacuum injected grease inside the chain joint Shot-peened alloy steel side plates for high tensilestrength and maximum impact load resistance High carbon alloy steel bearing pins for excellent resistance to wear Gold colored side plateshelp prevent corrosion Pre stretched to enhance performance of the chain