Yenmet metallic thread is a fine quality import thread from Japan, prized by many international teachers and specifically designed for today's high speed embroidery machines. It has been developed to run at high production speeds without breaking, tangling, or shredding. Unique construction of a nylon core wrapped in a silver exterior which is dyed and the coated with a polyester film provides an incredibly smooth finish and vibrant color sheen. 546 yards/500 meters spools. Copper, color #S1.