Factory Spec, FS-630X-G, 630 x 90 Heavy Duty GOLD X-Ring Chain 630 Pitch x 90 Link XRing With Master Link Manufactured by Factory Spec Designed to meet the demands of today's high-performance machines Reduces friction and power loss up to 40% over traditional O-ring chains Seals better than traditional O-ring chains Lasts 50% longer than traditional O-ring chains Tensile strength of 10,800 pounds Made in China