Detailed Description  The FIRST O-ring Motorcycle Chain Manufacturer in China Mainland, Our YF/QJ brand O-ring chain be recommend the one of Chinese chain association, be recommend to worldwide. - Model: 420,428, 428H,520, 520H, 525, 525H, 530, 530H, 630, 630H - Color available: Natural, Blue, Brown, Nickel, Copper QUALITY MAKE US DEVELOPPING. Chain Tensile Strength List: UltimateMinimum WeightNoModelTensileTensileperStrengthStrengthMeterQQ0qminkN/LBkNkg/m1420 19.400 17.100 0.550 2420 H 19.400 17.100 0.630 3428 20.400 18.800 0.690 4428H 27.000 22.500 0.790 5520 36.700 29.600 0.890 6520H 42.800 37.800 1.100 7525 36.700 29.600 1.060 8525H 42.800 37.800 1.200 9530 36.700 29.600 1.060 10530H 42.800 37.800 1.240 11630 49.500 40.800 1.800 12630H 66.300 56.100 2.160