The set contains 12 plastic spirals in 6 different colors to hold and store your pairs of knitting needles together.
Spirals are suitable for 2.0-5.0-mm needles (6 pieces of spirals) and 4.5-6.5-mm needles (6 pieces of spirals), and they can be used for both straight and circular knitting needles - why not also for double pointed needle pairs.