Description: Connectable & Expandable: The hamster cage tunnels set are expandable and designed to connect to other habitats, provide an unlimited amount of living space for your pet hamster, gerbil, mouse or small pets. Sturdy Material: The hamster tubes are made of high quality material ABS to prevent pets from biting it. Rugged inner surface, good for climbing, long time and more fun. Transparent Pipe & Simple Installation: With these hamster pipes, you can see the pet's state in the pipe through the transparent pipe, and better observe the pet's every move. Hamster tunnels easy to assemble with hands, it is simple and convenient, and you can create unique toys for your pet based on your own ideas. Pet Tubes: Curious Pets Are attracted to interesting tunnels, which will enhance increase your pets quality of life and bring even more interesting and entertaining venues in which hamsters can exploring, exercise and simply chill out. Satisfy your pet's natural instincts. Dimensions and Packaging: Tunnel diameter: 5.5cm/2.17", great for Hamsters, ferrets and rats, guinea pigs and small pet. Our hamster cage tubes onsist of totally 8pcs and they can be spliced together to connect the hamster bathroom of the same diameter. Size Chart: Tube Diameter: 5.5cm/2.17inch Package Includes: 1 Long Straight Tunnel 2 Short Straight Tunnels 1 Three Way Tunnel 4 Bend Tunnels Note: Please allow slightly errors due to manual measurement and different monitors.