Denise Interchangeable Knitting Needles Companion Set. These are perfect for use as flexible straight needles or circular needles in a vast variety of lengths. This package contains six cords (5in 9in 12in 14in 16in and 19in) 4 end buttons and 2 extenders. These are intended to be used with Denise Interchangeable Knitting Needles and Crochet Hooks only. Sets are available in a variety of colors: each sold separately.