Material quality: Black steel wire, music wire, lead wire, stainless steel wire and so on; knitting and characteristic: Rolls over first posts-edit, bidirectional separates the wave curving, to tighten, the flat top curving, bidirectional curving, to separate the wave curving to be curving one way; Sturdy construction; use: Uses in professions and so on Mt. Meishan, mine, building.