Alfie Pet by Petoga Couture - Paddy Tunnel Living Habitat for Mouse, Chinchilla, Rat, Gerbil and Dwarf Hamster - Size: Small Measures 9.75" in height, 7.75" width and 10" in length. Convenient for ventilation and easy to observe the behavior of animals. Perfectly sized and heavy enough to stay put. Made with pet safe materials that is easy to clean and resistant to odors. Assembly is required