Alfie Pet by Petoga Couture - Kasey Hammock for Mouse, Chinchilla, Rat, Gerbil and Dwarf Hamster Suitable for Mouse, Chinchilla, Rat, Gerbil and Dwarf Hamster. Measures 9"L x 9"W These comfy cage hammocks are a must-have for any pet cage. Fleece lining material provides a comfy environment for your pets. Easy and quickly attaches to cage interiors with included spring clips. Easy to clean - hand wash or in washing machine(need to protect metal hooks).