Royale Fine Crochet Cotton. Fine crochet thread for fine crochet work; such as doilies; table runners; home decor and accessories. 100% Mercerized Cotton; 3 ply; size 20; 400yd/365m. Suggested crochet hook: 10/1mm. Care: machine wash (max.temp. 104F/40C); dry flat; do not bleach; iron low; do not dry clean. Imported.