Exceptionally beautiful Valdani Perle Cotton, Hand-Dyed with Lead-Free Dyes and Guaranteed Colorfast for any Embroidery, Quilting, Appliqu, Crochet, Punchneedle, Rug-Hooking, Thread Embellishment, wool appliqu, crazy quilting, fringe-making. For machine quilting or stitching: You can successfully use Perle Cotton Size 12 both Top and Bobbin. All the other sizes are recommended for bobbin work. Size 12 (the finest) 100m – For: patterns where you want a finer thread for more definition, in Embroidery, Stitching, Quilting, Crochet, Punchneedle, heavier Tatting.Size 8 (medium weight) 67m – For: Stitching, Hand Quilting, Appliqu, Crochet, heavier Punchneedle, Rug-Hooking, Bobbin Work.