520 FB Chains are the strongest and most durable chains offered byMoose Racing. They are made with fine blanking, which allows for tighter tolerances. Paired with grease impregnated o-rings for less friction, these chains go above and beyond in the motocross racing community. This 520 sized drive chain, built for 450cc's and up, comes with clip style master link, 100 to 120 links of durable silver inner plates, nearly 8,000-pound tensile strength, and gold links and rollers that are designed to stop rust in its tracks.