SANKO Hamster Pipe Set Tower [Product Features] Connect and have fun! Expand your hamster's world! [How to Use and Important Notes] Sanko's Hamster Pipe series utilizes the hamster's natural instinct to dig burrows and build nests, providing a wider range of movement and toys for stress relief. Tunneling is a favorite activity for hamsters, and you can enjoy watching them move through the pipes and relax in their resting places. Can be attached to a Roomy cage. The tunnels are separate items, purchased from Rakuten. Used a few times, then disinfected, thoroughly washed, and sun-dried. Everything included is shown in the photos.