Upgraded 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 525 BMOR chains come with rivet link Average tensile strength of 9,300 lbs. This chain must be correctly matched to the machine size and power output. Failure to do so could result in failure of the chain, causing damage to the machine or other property, serious injury to the rider or others, or even death of the rider or others. It is the responsibility of the installer to ensure that the chain selected is correctly matched to the machine and installed correctly. If you have any doubts, contact a professional before use.