To kimmys29-I was thinking the same thing for my 2 rats. It would depend on if the rats are chewers (eat through the material) and where the tunnel will be used. It may be too big for a habitat and should not be tied outside of one w/o supervision. It would be great for when they are outside of the habitat for play, if it doesn't fit well inside. One of mine is a chewer and would tear through that, so not bidding.