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It is related to HP
Quadra-X ring design increases wear life and reduces friction by as much as 40% for maximum engine performance
Extended PU synthetic gaiter helps seal out excessive water and dirt entry
Both 420 and 428MXZ racing chains are the lightest and strongest in their class
Inner fleece lining for thermal warmth and comfort
RK 520 MXU UW-Ring Chain 800R It is related to HPRK GB 520 MXU U Ring Chain MXU is one of the lightest sealed ring motocross chains available on the market today. Made for the professional motocross racer, MXU series is the next generation of motocross racing chains featuring RK's ultra slim U Rings or UW Rings. MXU chains are designed to provide the most consistent power delivery with increased chain life. All components are heat treated using RK's exclusive HIT (Heat Induction Transfer) Process.