Includes 40 spools of Mettler Poly Sheen® 40weight, 100% trilobial polyester, highly brilliant decorative sewing and embroidery thread. Unlike conventional decorative sewing and embroidery threads, Poly Sheen® has a larger light reflecting surface and consequently a much more brilliant sheen. Excellent sewing, quilting and embroidery qualities, without thread breaking even at the fastest machine speeds.