Aunt Lydias Extra Fine Crochet Thread. High luster, mercerized cotton thread, Aunt Lydia"s Classic Crochet Thread is perfect for delicate crochet projects both large and small. Available in traditional colors, Aunt Lydia"s Classic Crochet is ideal for heirloom-quality home decorating and fashion projects Features: size 30, 100% mercerized cotton, 500 yds/457m. Recommended crochet hook: 12 (.75mm). Care: machine wash gentle (max.temp 104F/40C), roll in towel & block, do not bleach, do not dry clean, do not iron.