Circular needles have many uses besides knitting in the round. But they can be a PITA when new, due to that pesky coil and twist the cable has after being removed from the package. Actually, the cable itself is basically straight, but gets twisted from the way it’s packaged. Luckily, it’s a simple matter to uncoil them. Just heat up some water (not to the boiling point, though) and dip the cable for a second or two, then remove and gently pull it straight until it’s cooled. Be careful not to dip the needles themselves or the places where the cable is joined, to avoid damage to those parts. When storing circulars, be sure not to wind them up again, or the twistiness will again set in. Here’s a link to instructions for an easy, no-sew storage device that you can quickly make yourself, to avoid that problem.