These needles are fantastic! The tips are changed by pressing the joint together and a small twist. That unhooks the pin in the joint. So when you are busy stitching away, your tips will not unscrew from the cords. absolutely fantastic. Made from nickel-plated brass Polished needle tips are both smooth and light-weight Creates an effortless and comfortable knitting experience Comes in a perfect-size travel case Contains 10 sets of interchangeable knitting needles in sizes 3.50-10.00mm