The Kollage square circular needles have the original "k-cable" which means that it does not "kink, kurl or knot" and is super flexible, almost floppy! There definitely won't be any hassle with cords that are too stiff with these needles! Also, the needles themselves are made of a lovely high grade aluminum in a titanium color and have precision point tips. The square shape is easier on your hands and also can make your stitches straighter and more uniform. Read the full description...