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. CHAIN 520GPZ X 120 LINKS