The original interchangeable with color! Create circular or straight knitting needles in 10 sizes, US #5(3.75mm) to us #15(10mm). Compact case for easy organization. Six cords for circulars from 17" to 28" plus 4 end buttons and 2 extenders. Any cord becomes a stitch holder with the included end buttons. Made in the USA and guaranteed with normal knitting use. Unique locking connection - no tools needed!