Coats Crochet Fine Crochet Thread, 20, White Aunt Lydia has been America's favorite brand for over 100 years High luster mercerized cotton thread Aunt Lydia's classic crochet thread is perfect for delicate crochet projects both large and small Features: size 20 100Percent mercerized cotton 400 yds. Solids: 150 yards shaded: 100 yards 100Percent mercerized cotton