Karbonz Interchangeable Circular NeedlesInterchangeable Circular Needles from the Revolutionary and Stylish KnitPro Karbonz Series. All needles in the series are made of lightweight and elegant carbon fiber that makes this particular knitting experience something you don't wanna miss out on. The reinforced tips in the brass lets the needles slide easily and elegantly through the masks, regardless of which yarn you use. The interchangeable circular needles are available in all sizes from 3 8