This is 3-strand black polypropylene rope, the diameter is 25mm. It can also be made according to your requirement.
Polypropylene filament ropes with light texture, low density, can float on the water, convenient operation, but the abrasion resistance and strength is poorer than other material. The strength will be impacted as the result of long-term exposure to the outside. It is mainly used in ocean transportation, fishing, shipping etc.