Coats & Clark Dual Duty Plus Button & Craft Thread is the heaviest hand sewing thread made of cotton covered polyester. Enjoy hours of pleasurable sewing without fraying. Whether you use it to sew buttons on coats or use it as bindings on rugs, this heavy duty thread is very efficient. Easy to work with, it has a polished glace finish to protect from tangles and abrasion. Choose from several colors available, each sold separately.