1Made of quality bamboo material, safe, non-toxic, durable for long time use. 2Multi-function toy, can be used for playing, tooth grinding, or nest. Hamster can shuttle, hide, or rest in the tunnel. 3With holes, convenient for you to view its behavior. 4Provide a comfortable place for pet to play, and it also can help it to keep tooth healthy. 5Wonderful gift for small pet, like lovely hamster.