SANKO
SANKO fretwire is produced by Sanko Seisakusho who is a manufacturer specializing in precision variant wire and has developed new technologies to meet the needs of the present age. Fretwire for acoustic guitars, electric guitars, ukuleles, and others are usually available, but a special order such as changing shapes, changing hardness, undercut for binding, and others is welcomed as well.SANKO : https://www.hosco.co.jp/sanko/