The Dual Duty Plus Thread by Coats & Clark is perfect for heavy-duty projects. Use it for embellishment on canvas, to topstitch on jeans, or to repair heavy fabrics. Each spool contains 60 yards of abrasion-resistant 20wt thread. Dual Duty Plus Thread has a polyester core for added strength, with a heavyweight outer cotton cover. For best results, use a size 16 or 18 machine needle. Or, if hand-stitching, sizes 1-5 depending on your project.