We offer twin ring wire quality and cost control:1. Manufacture start from nylon coated book binding wire, wire forming machinery and twin ring wire;2. According the product serial number can tracking the entire production action;3. Product inspection, workers, equipment manager is responsible for quality with rewards and punishments system;4. Localization. Type: 3:1 and 2:1 pitch;size:316'' to 1-14''pattern: nylon coating;grade: non-toxic;color: black, white, silver, red, blue, golden, bronze;length: precut box and spool