"Manufactured from dense polyester web, this Ratchet Tie-Down Strap has the same 5,400 lbs. working load limit of nylon, but is thinner, won't stretch as much, and will stand up better to moisture and acid. Featuring two high-quality flat hook ends, which are less likely to bend and break than other styles, this 4"" wide strap is perfect for securing loads on flatbed trucks and step deck trailers. Web assemblies should be stored in a cool, dry, dark place and cleaned with plain water only, never machine washed."