The original interchangeable! The Denise pink set includes 10 needle pairs in US 5/3.75mm through 15/10mm. The six included cords make circulars from 17" to almost 60" when joined with the two included extender pieces. Four end buttons make stitch holders on any cord or act as end stops for straight, flexible needles. The set is 100% US-made and guaranteed with normal knitting use. Each purchase of a Denise pink set sends a $5 donation DIRECTLY to a ground-breaking breast cancer research lab (more info at www.knitdenise.com).