This is a Lightweight monofilament polypropylene Magenta barricade rope that floats in water and has excellent resistance to oil marine growth and most common chemicals available only at Flexra Safety. Designed not to rot this rope has good abrasion and UV resistance allowing for the color to last the life of the rope.
https://www.flexra.net/products/flexra%E2%84%A2-barricade-rope-magenta-yellow