Stretchy, vibrant, and colorful, self-patterning Bamboo Pop Sock is 100% wool-free. Great for cheerful socks, accessories, baby knits, and more! 450m (492yds) and 100g (3.5oz). 55% Bamboo, 37% Cotton, 8% PBT. Machine wash warm, dry flat. 5 balls/bag. The recommended knitting needle is 2.25mm (US size 1) = 30 sts x 28 rows = 10cm (4″) in ST st. The recommended crochet hook is 2.75mm (US size C-2) = 24 sc x 28 rows = 10cm (4″). Remember to ALWAYS check tension/gauge before beginning your project.