Aunt Lydia's Crochet Cotton. This high shine mercerized cotton crochet thread is perfect for both small and large crochet projects. This yarn is available in a wide range of neutral solids and attractive multi-colors that are ideal for home décor and fashion projects. Crochet hook size 7/1.5 mm is recommended. Care: machine wash warm, gentle cycle. Dry flat. Do not bleach, do not dry clean. It can be ironed. Imported.