These are the little colored see through igloos, big enough for ferrets to get into (not the tiny ones for mice), that are sold at Petco and Petsmart in our area for $4.99. The one I have is domed and in see through blue. The newer style has a castle type top to it. I refer to them as cars because the ferrets get into them, at least the front part of their bodies, and go forward like they are driving. They can see through them so they know perfectly well where they are going and boy do they go well on carpet! Only problem is some are better drivers than others (ouch, that was my foot you just drove over....). Hugs to all. tle Troy Lynn Eckart Ferret Family Services http://www-personal.ksu.edu/~sprite/ffs.html http://www.geocities.com/Petsburgh/Haven/5481/ Please sign up to support our charity http://www.iGive.com/html/ssi.cfm?cid=46&mid=58395 [Posted in FML issue 3510]