Valdani Wool Threads are made of the highest quality 100% Merino Wool! Soft to the touch, easy to work with, and produce beautiful results! These hand-died colorfast skeins come in 2 sizes. Size 15 is Fine and perfect for Lace Work, Crewel, Wool-Applique, and Crochet. Size 8 is heavier and great for Crewel, Wool-Applique, Embroidery, and Crochet.