Flat Film Polyester Thread: Add the ultimate sparkle to all of your decorative projects. They are thin, flat ribbon-like polyester film that is metalized with aluminum to make it brilliantly reflective.
For best results use a Metallic Needle size 14/90 or Embroidery or Top-Stitch Needle size 14/90 and a vertical spool pin. Lower the top tension, sometimes a lot and skip the last tension guide. A vertical spool pin is also absolutely necessary! A polyester bobbin thread like Superior Threads – The Bottom Line is a must.