Add an extra level of fun to your pet's habitat with the Moss Hollow Highrise Expansion Home! The perfect addition for gerbils and other small animals, its vibrant purple and green accent colors add a pop of personality to any tank. Keep your furry friends entertained with this exciting new feature. Convenient fully assembled design Easy access top door entry & large front door Made using chew-proof coated wire. Attaches to the top of a standard 10 gallon fish tank. (Not included)