Diamond Chain Company XLO O-ring Chain XLO-15548-106P O-ring chain seals out abrasives and seals in dual lubrication with factory injected, heavy grade lubricant O-ring lubrication keeps the chain lubricated and prevents premature elongation and contaminants out of the pin/bushing joint Features oil-impregnated sintered steel bushings Includes master link Average tensile strength 9300lbs.