Expand your pet's activity space with the Super Pet Critter Trail Accessory Kit. Universally connectable, this hamster Habitrail kit can also be used with other habitat systems such as S.A.M. and Habitrail. It's great for adding extra living space and exercise opportunities for hamsters, gerbils and mice. The Super Pet habitat activity kit includes a Loop-d-Loops with a bubble plug that create a lookout spot for your pet. The outhouse makes a secure nesting box, while the Snap-On comfort wheel provides a place for your furry friend to exercise. This multipurpose Super Pet Critter Trail Accessory Kit is a pet habitat expansion set that uses a bubble wave Fun-nel tube design that is safe for little paws, and Antimicrobial technology for a healthy and clean home.