Add the ultimate sparkle to all of your decorative projects. Sulky Sliver is a thin, flat ribbon-like polyester film that is metalized with aluminum to make it brilliantly reflective. Perfect for Sergers - Sewing Machines - Knitting Machines - and Hand Work! A Metallic Needle size 14/90 or Embroidery or Top-Stitch Needle size 14/90 is recommended as well as a vertical spool pin. Machine washable and Iron on low heat.~