CBKnot rope is manufactured to specifications from Columbia Basin Knot Company, LLC. Polyester rope has low stretch and great abrasion resistant properties. Made in the USA! Our Average Tensile Strength 1/4" = 2,031 lbs., 5/16" = 3,010 lbs. 3/8" = 4,800 lbs., 1/2" = 7,850 lbs., 9/16" = 9,500 lbs. & 5/8" = 10,200 lbs.