Lang Yarns Donegal knitting yarn is a pure wool yarn made in the true Irish tradition, knits on knitting needles 3.5 and 4 mm (US 4-6 / UK -8) for a gauge of 22 stitches and 30 rows.
In a 50 gra ball there are about 190 meters (207 yd) so plan on:
450g = 9 balls for men size M
300g = 6 balls for women size M
200g = 4 balls for children 10 yrs.
Hand wash with detergent for wool without fabric softener.