KnitPro Indigo Wood Interchangeable Circular Needle Set includes eight pairs of interchangeable needle tips and four cables (with end stoppers and cable keys) for the tips. The needle sizes are 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 7.00 and 8.00mm, and cable lenghts (when attached to the 13cm tips) are 60cm, 2 x 80cm and 100cm. The needles and cables are packed in a "washable" paper lining and denim fabric pouch, with some pockets for the needles inside.
When tips are attached to the cables, you get a circular needle. The tips can be screwed by hand to the cable. The cable key that comes with the cables is used to slip through the tiny hole on the cable end and used as leverage to tighten the cable. Without carefully tightening the tip to the cable, the twist may loosen a bit.