Londonderry Linen Thread is one of Purl Soho's most exceptional embroidery threads. One hundred percent pure linen, this beautiful thread has a subtle matte rusticity, a naturally smooth finish (no wax!), and an unbeatable strength. Available in five weights, this one is the thickest. Use it for substantial embroidery, including counted cross-stitch! Please note: This thread is made with three plies, which should not be separated for use.