["Description:\n\nFeatures:\nbrand new and high quality\nAny external pipe cage can be connected as long as the size is the same.\nUsed for blocking the exit, prevent baby escape.\nMade of high quality plastic, sturdy, long lasting, easy to assemble and take apart for cleaning.\nInner diameter: 2.17 inch, great for hamsters, ferrets and rats, guinea pigs and small pet.\n\nSpecification:\nMaterial: Plastic\nInner diameter: app. 5.5cm(2.17in)\nOptional Color: Blue, Green, Pink, White\nQuantity: 1 pc\n\nNote:\nTransition: 1cm=10mm=0.39inch\nNo retail package.\nPlease allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes:\n1 x Hamster Tunnel Plug(other accessories demo in the picture is not included.)"]