If you appliqué, then not only do you need these silk threads, they are the only threads you'll ever need. I first learned about them in a class that I had taken with Baltimore Album Quilt icon Elly Sienkiewicz years and years ago. When you appliqué with silk thread, all of your threads bury themselves into your cotton fabrics making it vitally impossible to see your stitches. No matter the color of my fabrics, I use the value of thread that best matches the value of my fabrics — light, medium, or dark. It's miraculous! There are 5 wonderful 100 wt. spools of the YLI silk thread basics in this grouping. Each spool is 200m.