Lang Yarns Cashmere+ knitting yarn is composed of 100% cashmere and knits on knitting needles 5.5 and 6 mm (US 9-10 / UK 5-4) for a gauge of 16 stitches and 22 rows.
A 25 gram ball contains about 45 meters (49 yd) so for quantities of yarn to knit a sweater plan on:
300g = 12 balls for men size M
225g = 9 balls for women size M
150g = 6 balls for women size M.
Hand wash with detergent for wool without fabric softener.