1,100% high tenacity polyester; 2,Elongation<7%; 3,Simple to use:pull to tighten & press to ... release 4,good ratchet and hook 4 packs 1" 1500LBS ... and easy to use, and no damage for cargo.1, Material: 100% high tenacity Nylon;2, Manufactured to ... 4,Temperature range:-40°c--100°c;5, Safety factor: 2:1 or 3:16, Elongation<7%Warning:1, Only use undamaged cargo ...