Lang Yarns Merino 70 knitting yarn is a heavy weight yarn composed of 98% merino wool and 2% polyester and knits on knitting needles 6-7 mm (US 9-10.5 / UK 4-2) for a gauge of 14 st. and 22 rows.
There are about 70 m (76 yd) in a 50g (1.75 oz) ball so plan on:
750g = 15 balls for Men size M
650g = 13 balls for Women size M
450g = 9 balls for Children 10 yrs
Machine washable at 30°C (86°°F) with detergent for wool without softener, iron at low temperature.