Drainage tubing. The only drawback I know of is it is not as flexible because the plastic is much heavier. It is also not see-through. However, because it's sturdier, you can do more with it. I cut various holes along the sides so the beasts can duck in and out and lurk. You can also cut into whatever lengths you need. And there are none of those wires that spiral around and break as there are in the dryer stuff. You can wash it out by either sticking it under the shower (if it is short enough) or outside with a hose if it is longer. Give it back to them wet for an even bigger and better thrill. Some ferrets like jingly balls thrown inside it. Some will block it up with stuffies (making the ferrets use the cut-outs to go around.) And, if you have a dog, it will drive hem nuts as they watch the ferrets pop in and out, making all sorts of racket. Oh, it and makes a great, tickity sound when they race through. Noise! Always a plus if you are a ferret. And it also looks absolutely stunning (NOT!) when looped around and around the furniture. Total strangers will marvel at your avant-garde decorating skill. Your friends will just sigh. :-) anne [Posted in FML issue 5185]