Lang Yarns Merino 400 Lace knitting yarn, color 0039, is composed of 100% fine wool, knits on knitting needles 2.5-3.5 mm (US 2-4 / UK 11-9) for a gauge of 32 st. and 42 rows.
There are about 200 m (218 yds) in a 25g (0.88 oz) ball so plan on:
400g = 16 balls for Men size M
300g = 12 balls for Women size M
200g = 8 balls for Children 10 yrs
Machine washable at 30°C (86°F) with detergent for wool without softener, iron at low temperature.