Features: 1.U-line can change the direction of the channel. 2.Suitable for hamsters, golden bears and other pet toys. 3.The product can be connected to let you do more Can create modeling channels. 4.The tube has an opening that allows you to breathe freely without affecting the game. 5.External tube connection assembly, DIY laughing hamsters 6.Promote a healthy Game and exercise 7.Applicable to: the multi-layer cage, expand the space 8. Ideal for hamsters, gerbils or cages. Mouse Scope of delivery: 1 x mouse whistle three ways. 1 * Long Straight Tube 2 x short straight tube. 4 x curved pipe.