Hamster whistles are made of high density plastic, are sturdy yet relatively easy to disassemble/replace. Easy to clean. Perfect toy for hamsters. Capture every beautiful moment. Through the transparent tube, you can see the condition of the animal in the tube and better observe every movement of the animal. The external tunnel expands the space for the hamster cage and offers more freedom of movement for hamsters. Hamster tunnel can be connected with both hands, it is simple and convenient, and you can splice. You can easily install the tubes on the cage. You can create a novel exercise space for your lovely pet without any instruction. Hamster toys and accessories, small animal toys and treats, small animal toy set. Hamster toy Syrian chews. You can mix and match the outer rail as you like, and multiple groups can be joined together to connect the same diameter hamster bath. Designed to connect with other habitats and create unlimited living space for your hamster, gerbil or pet rat. Product Material: Plastic Size: Caliber 5.5