Here: http://tingilinde.typepad.com/starstuff/2006/12/ferret_wheelcha.html#comment-26428316 and here is one with a ferret using it: http://www.ferretfarm.org/index.html?target=dept_98.html&lang=en-us It cost us $50 and is worth it. Wonderful workmanship and good on carpet as well as hard flooring. Right now we don't have one in need, but having been there and having to wait we decided to get this one to have around simply because we were already so impressed by it. Sukie (not a vet) Current FHL address: http://groups.yahoo.com/group/ferrethealth People can join there or can send a blank mail to the automated joining address: [log in to unmask] and then follow the directions. (The second is recommended for those having problems with Yahoogroups web settings, and afterward send a blank mail from your subscribed address to [log in to unmask] to get the digest instead of individual mails. ) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/fhc/ http://www.ferretcongress.org/ [Posted in FML 5454]