FS No.40 1000m Col.Silver Dtex 220 Den 200 40% Metallic. Polyester35% PA, 20% Paper FS 40 is the standard weight metallic thread. It is suitable for sophisticated embroidery designs onto elaborate materials. Made with real silver. High performance, smooth, traditional thickness with high tenacity and a special twist. Ultimate results for all styles. Standard weight smooth, supple embroidery thread ensures trouble free stitching even at high speeds.