Sirdar Happy Cotton is a 100% cotton DK weight machine washable yarn.  These are, by far, the cutest balls of yarn.  Each 20 g ball contains 43 m/47 yards of yarn.  One look and you will want to collect all the colours.  Perfect for amigurumi.  

Happy Cotton Pattern Books 1 through 10 are designed to go with the Happy Cotton DK yarn.

Recommended needles: 4 mm (US 6) - 4.5 mm (US 7)

Recommended crochet hook: 4 mm (F) - 4.5 mm (G)