Features: 1.Made of quality bamboo material, safe, non-toxic, durable for long time use. 2.Multi-function toy, can be used for playing, tooth grinding, or nest. Hamster can shuttle, hide, or rest in the tunnel. 3.With holes, convenient for you to view its behavior. 4.Provide a comfortable place for pet to play, and it also can help it to keep tooth healthy. 5.Wonderful gift for small pet, like lovely hamster. Specifications: Condition: 100% Brand New Material: Bamboo Color: yellow Options: S, M, L SizeLength(cm/in)Diameter(cm/in)Hole diameter(cm/in)S15/5.9over 5/23.8/1.5M18/7.1over 6/2.43.8/1.5L21/8.3over 7/2.83.8/1.5 Package Included: 1 * Hamster Tunnel