The legs are made from Approx. 14-16" rubber bunge cord. The kind you find in the automotive/camping section. The ones I have purchased came with metal S-Hooks in both ends (easy to remove).
If you have any more questions, just ask, I've made bunches. The only thing I could not find that is different in the ones I made is the diameter of the slinky. The Jr. Slinky (plastic) is still a little wider and the smaller gift bag type slinkys were not strong enough. It doesn't matter if you use the larger one though they still have the same effect.
www.spandexworld.com is a good place to get low cost blacklight spandex. Attached is a picture of samples. The fourth one on the right, the one that looks like brush strokes would be good (PS1764 product code $8.00), because of the smaller print. They also have solid colors. I try to buy my spandex in the spring when swimming suit material is avaliable at Hancocks, a little lower in price.
Julie