Pony Bamboo Interchangeable Knitting Needle Tips can be used for flat knitting as well as working in the round. At the end of each row, just switch the needles around as you would with normal straight needles. Your project sits in your lap as you work, instead of hanging off the needles - much easier for larger, heavier items. Needles between 3.00mm (US 2.5) and 4.00mm (US 6) have stunning gold tips, where as the needles between 4.5mm (US 7) and 10.00mm (US 15) have sleek black tips. Circular needles also allow you to knit 'tube' projects in the round such as socks, cowls, hats - anything you fancy really!