Each ball weighs 50 grams and has 150 meters. This is a medium weight yarn and we recommend using size 6 - 7 (U.S.)/(4 - 4.5 mm) knitting needles and size E4 (U.S.)/(3.5 mm) crochet hook. 7 balls of yarn are required to make a size 12 woman’s short sleeved jumper. To make a 4x4” tension square work 20 sts and 28 rows. Machine washable up to 30º with a short spin cycle. Do not tumble dry.