Karbonz needles are made from high-tech carbon fiber with tips in nickel plated brass. The light bodied carbon fiber & sharp brass tips is guaranteed to provide an unparalleled knitting experience. Ideal for all types of yarns and for every project. Customizable cord length. The Special tips are smaller in length (approximately (3.5") than the normal interchangeable tips (4.5") and are meant to be used with 16" cords.