Description: Connectable & Expandable: The hamster cage tunnels kit 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 tube set is made of high quality plastic to prevent pets from biting it. Rugged inner surface, good for climbing, long lasting and more fun. Transparent Pipe & Simple Installation: With these hamster tubes, 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. Fun Pet Tube: Curious pets will be 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 explore, 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 kit is consist of totally 8pcs and they can be spliced together to connect the hamster bathroom of the same diameter. Specification: Material: Plastic Size Chart: Diameter: 5.5cm/2.17inch Package Includes: A set of pipes includes: 1 Piece Long Straight Tunnel 2 Pieces Short Straight Tunnels 1 Piece Three Way Tunnel 4 Pieces Single Bend Tunnels Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!