Polypro Knit - our hollow braided polypropylene cord is an easy to use, economical universal medium stretch cord designed for crowd control, concerts, trail marking, obstacle marking, ski resorts, construction areas, swimming areas and golf courses. Strong, lightweight hollow weave technology provides exceptional durability for lightweight feathered ropes. Polypropylene fibers are naturally hydrophobic and resist weather, chemicals and wear. Affordable quality - polypropylene is less expensive than nylon or polyester and still has abrasion resistance. high traction and excellent knot retention. The maximum width is 1000 pounds. When buying in bulk, use the money saved to purchase large items that require a lot of string. Length / Width / Color - select a pre-cut length of 50, 100, 500 or 1000 feet. Sgt Knots Hollow Wire Diameter Thickness options: 3/16", 1/4", 5/16", 3/8", 1/2", 5/8" or 3/4". Available in 8 different colors: black, green, white, yellow, green/white, blue/white, orange, and red. Veteran owns and operates - just like the Marine Corps, SGT Knots is committed to being the best among best. We continue to adhere to the motto "always faithful". Our loyalty to our customers determines who we are and is the reason for our growing popularity and product offering. We are committed to maintaining the intensity and consistency of our products. We also pass on substantial savings to our customers.