1,metal spiral coils 2,colorful color for choice 3,service OEM order 4,free cut; fastdelivery,bright suface 5,pass SGS test 1, metal spiral coils are guaranteed by ROHS and ASTM certification2, thin smooth and symmetrical nylon coated 3, we enjoy a reputation from home and overseas4, we have strenthed cartons to protect the products from the damage5, no color fading6, made of high quality nylon ...