metal spiral binding wire low carbon o binding wire bright surface and no fading spiral binding coils it passed SGS 1, material of metal spiral binding wire: high quality nylon coated wire2, color of our metal spiral coils: black, white, blue, red, yellow, pink, gold, silver, bronze ect,. Customer can custom whatever color you want 3, It is used for notebook, diaries, calendars, catalogue ect., 4 ...