Great hidey-hole for guinea pigs.
My two girls love this tunnel. They've had fun eating the hay and are now using the cardboard base to keep their teeth trim. I've hung the tunnel on the side of their cage, (I made two holes in it to do this and added twisty wire), and they love to hop up and hide in it while I clean their floor so it has become an exercise toy as well. Great value and great fun for the piggies too.