Sulky Sliver Metallic Thread at discount prices! A ribbon-like polyester film that is metalized with aluminum to make it brilliantly reflective. For sewing machine, serger and handwork. For best results use on a vertical spool pin. Set top tension on a lower setting. Use a 80/85, 14 needle (embroidery or top stitching). Sew at a slow or moderate speed. In the bobbin use Sulky Metallic 40 weight fine sewing or basting thread.