Silco is a 35wt cotton thread, but unlike other cotton threads, this one is 100% LINT FREE and comes with no waxes or coatings, making it the perfect choice for sewers who want o avoid lint and redeye buildup in their machines. This unique thread also carries a sateen finish which makes it perfect for machine embroidery, quilting thread painting, or any project using decorative stitches. Available in 30 beautiful solid colors and 30 variegated colors, Silco is. strong and color fast making it a versatile thread in your sewing room. We recommend using our Wonder Guard with this thread due to it slippery nature.