Valdani Perle Cotton is made from long staple cotton that is mercerized for softness. Exceptionally beautiful Perlé Cotton, Hand-Dyed in Lead-Free Dyes and Guaranteed Colorfast for any Embroidery, Quilting, Appliqué, Crochet, Punchneedle, Rug-Hooking, Thread Embellishment project. Size 12 (the finest) - For: patterns where you want a finer thread for more definition, in Embroidery, Stitching, Quilting, Crochet, Punchneedle, heavier Tatting. Size 8 (medium weight) - For: Stitching, Hand Quilting, Appliqué, Crochet, heavier Punchneedle, Rug-Hooking, Bobbin Work. Size 5 (heavy) - For: Stitching, Quilting, Bobbin Work, Crochet, Rug-Hooking, Tassel and Fringe-Making. As many Designers use their beautiful Hand-Dyed, Colorfast Perle Cotton, for each pattern you can now get the respective customized thread collection. This is a HUGE convenience and ease for the customer: to find the pattern together with the threads it calls for. At the same time, the possibility of selling/purchasing the pattern together with the respective customized collection thread is highly beneficial for both the Designer, the Shop and the Customer.