The Next Level. Guaranteed. Mika Metals Factory Series Chains use exclusive next level bushings that slow elongation of the chain and increase chain life. They have the lowest amount of friction on the market, are extremely lightweight, and are simply the ultimate racing chain. Average tensile strength of 9,300 pounds. Recommended displacement: 125cc - 600cc. Weight (per 100 links): 3.5 pounds. The 520 X-Ring chain has 118 links. Includes clip-style master link. Seven-day money back guarantee.