BikeMaster 525x150 BMOR O-Ring Chain - Gold/GoldO 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. Note: This chain must be correctly matched to the machine size and power output. Failure to do so could result in chain failure, causing machine or property damage, serious injury or death. It is the