RK 428 MXZ GB Heavy Duty Chain - 120 Links , Chain Type: 428, Chain Length: 120, Chain Application: All GB428MXZ-120 Made for the serious motocross racer with all components heat-treated for high-performance durability Feature chromoly steel construction with seamless rollers and bushings, and oversized alloy pins for added strength Ideal for professional level from 80cc to 500cc open class racing Chains include clip connecting link Average Tensile strength 5,400 lbs.