Penn Plax S.A.M. Toob - A - Pack Raceway Kit
Compatible with all Crittertrail, Habitrail, Nature's Playland, and SAM Modular systems. With S.A.M. Small Animal Modules, you can create an exciting, ever-changing environment for your pet. All S.A.M...
Pros: Adds excitement to your small animal's life. Visually interesting
Cons: Overpriced Cheap Chinese Plastic