Lang Yarns Merino 120 knitting yarn is composed of 100% merino wool and knits on knitting needles 3.5-4.5 mm (US 4-6 / UK 9-7) with a gauge of 22 st. and 32 rows.
In a 50g (1.75 oz) ball there are about 120 m (131 yd) so for quantities of yarn plan on:
750g = 15 balls for men size M
600g = 12 balls for women size M
450g = 9 balls for children 10 yrs
Machine wash at 30°C (86°F) with detergent for wool without fabric softener.