50 g balls of yarn with 115 metres. Recommended knitting needle size: 5-6 US / 3,5-4 mm and crochet hook size: E4-G6 US / 3,5-4 mm. 11 balls of yarn are needed to make a woman's size 12 long sleeve jumper. For the 4x4" / 10x10cm tension square work 23 stitches and 30 rows. Machine washable up to 30° with a short spin cycle. Do not tumble dry.