[Quality materials] pipes are made of plastic, Sturdy yet relatively easy to take apart / change.Easy to Clean.Perfect toy for ,Record lovely moment. [Transparent Pipe]You can see the pet's state in the pipe through the transparent pipe, and better observe the pet's move. [Combined Freely ] Each section of this tube can be disassembled and combined freely, you can create unique toys for your pet based on your own . [Size]The external pipe allows more room to expand the cage, giving the pet more room to move around.The inner diameter of the pipe is 5.5cm(about 2.17in). [ Pet Tube]This tunnels and tubes are expandable and designed to connect to other habitats, creating living space for your pet , gerbil or rat. 1.U line can change the channel direction. 2.Suitable for hamsters, gold bears and other pet toys. 3.The product can be connected so you can create more modelling channels. 4.The pipeline has an opening that allows you to freely without affecting . 5.DIY Outdoor Pipe Fittings Assembly for Hamsters 6.Encourage healthy play and exercise 7.Applicable to the multilayer cage, expand the space 8. perfect for hamsters, gerbils or mouse cages Colour: blue Material: plastic Package Contents: 1 x long straight tube 2 x short straight tubes 1 x 3-way tube 4 x curved tube Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.