Lang Yarns Rosanna crochet yarn is a yarn composed of 100% combed mercerised Egyptian cotton and crochets on crochet hooks 1.5-2.5 mm (US 1/B / UK 12).
There are about 140 m (153 yds) in a 25g (0.87 oz) ball so allow:
750g = 30 balls for Men size M
600g = 24 balls for Women size M
450g = 18 balls for Children 10 yrs
Machine washable at 60°C (140°°F) with detergent for wool textiles without softener, iron on medium.