I went to Home Depot, bought some 6" black drainage tubing at a cost of about $3 for six or so feet. The ferrets love it, it makes a great noise as they scamper through it, it is indestructible, and I mean indestructible, and it is very easy to keep clean. The price can't be beat, and I'll probably never need to buy a tube again! -Anne [Posted in FML issue 2721]