WonderFil Silco Variegated Cotton Thread 35wt / Tex 40 / 3-ply / 765yd (700m) spools. 35 wt 100% Lint Free cotton, strong and color-fast. Comes with no waxes or coatings. Silco is great for quilting, embroidery, decorative stitching, and thread painting. 3-ply, triple gassed and mercerized. It has a sateen finish which makes it particularly nice for any projects where you are using decorative stitches. Use in: sewing machines, embroidery machines, quilting machines, sergers. Recommended Needle Sizes: Machine 90/14 Quilting, 90/14 Topstich, 16 Longarm.