Ultra strong: ZVX3 series chains easily surpass every other brand with a tensile strength of 11,100lbs.New ZX-ring lasts 15% longer than ZVX seriesMinimizing the clearance between the plates for improved stiffness and weightAvailable in metalic colors and natural finishTensile Strength of 9400lbs. for 520 ChainsTensile Strength of 10,300lbs. for 525 ChainsTensile Strength of 11,100lbs. for 530 Chains