Knitter’s Pride Zing 40” Fixed Circular Needle. Zings fixed circular needles are vibrant color-coded aluminum needles that allow your yarn to slip easily as you work. They are color-coded by size making it easy to identify and organize your needles. These lightweight aluminum circulars feature durable, flexible cables with a smooth join for easy, no-snag knitting. These needles are also available in 16”, 24”, 32” and 47” lengths.