I have also brought in the nylon cables in the TWIST series from ChiaoGoo. The cables have no memory - so they don't get bent after you knit with them. Each cable consists of a steel wire covered in red nylon, and their fasteners are made with finlir that makes the transitions so good.
One detail is that the brackets have small holes for the lifeline and this is also where you tighten with a cable wrench when screwing the tippers together with the cable.
What you are buying here are only the cables that can be used with tips from ChiaoGoo. You screw together your own circular needle.