... steel wire; 2)large stock; 3)various colors; 4)passed SGS. 1.Our wire o is made of the ... coating is lustrous, extremely thin and symmetrical;3.The central steel of the wire is rigid, which make it stay for ... or durability, it will be more better than the normal double wire.5.Our wire o are easy ... and convenient to bind.6.It is suit for binding the book, calendar, live notebook, atlas, diary book, ...