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Developed exclusively for racing use, Utilize state-of-the-art materials for optimum performance and durability, Feature the patented Z44 sealing rings, which greatly improve performance and wear life, making previous X-ring and Z-ring chains obsolete, 50% reduction in friction compared to traditional O-rings, Constant lubrication from special high-temperature grease in the critical pin/bushing area provides long life, Suitable for Supersport and Superbikes up to 1,000cc