Nymo threads are designed specifically for beading. They are high quality, durable, lightly waxed and much stronger than cotton sewing thread. Avoid using sewing thread in any of your beaded creations! NYMO bead threads are perfect for stitching, looming, and detailed seed bead projects. NYMO beading thread sizes range from the thinnest "OO" and "O" which are great for very small beads or when multiple passes through the same beads are required, "B" is best for a wide range of projects and the thickest size is "F". Try to use the largest size thread permitted by your beads for the best strength.