Description: Hamsters are small animals that love sports. As long as they want to exercise during the day or night, our toy is a silent wheel and suitable for sports loversification: Weight:63g Size:12*12*6cm Color:blue/pinkPackage: 1*running wheelInstallation: 1. Align the yellow box with the square hole in the middle of the running wheel, and then snap it in. 2. Put the nut on the pump and tighten it. 3. Just hang the running wheel on the wire cage: 1. The dimensions are all manually measured, please allow a little error. 2. You can contact us if you encounter any problems during use, thank you.