O-ring chain offers high durability. Component designs, optimized with computer analysis, provide higher tensile strength. Specially controlled heat treatment means tougher material. Reinforced roller offers higher impact resistance and longer durability. Average tensile strength of 9,700 lbs. Max engine size of 1,000 cc street/750 cc offroad. Includes rivet master link...basically it's a damn good chain and you won't be bummed on it.