From HiyaHiya, these interchangeable knitting needles feature keyless screw on connections and swivel cables (swivel cables sold separately) in order to assemble desired circular needle size. Your stitches will glide effortlessly over these needles. They warm in your hands as you go, for a pleasant knitting experience. The large set includes a choice of 4" or 5" sets of tips in sizes from 9-15 US (5.5-10mm). Package includes 1 pair of interchangeable knitting needles.