And the winner of the "Most Popular" Contest goes to these fabulous colors. Sulky 40 Wt. Rayon machine embroidery thread has the same luster and soft, warm, natural look as silk with silk’s smoothness, but it is stronger than either silk or cotton thread of the same weight. It won’t fray, fuzz or shrink and it has less stretch than Polyester so it is the thread that most digitizers use as the standard for their embroidery designs.Recommended Needle Size: 12/80 or 14/90 Embroidery Needle -