Audubon's Cedar Bat Shelter has a single chamber that is large enough to house 20 bats. The interior and landing platform is made of rough cedar and is grooved to make it easily accessible for bats to cling on to when roosting and landing. Made from red cedar and assembled with zinc-plated screws this bat house will last for years. It is perfect for many types of bats including the little brown, southeastern, cave, big brown and the Mexican free-tailed to name a few. Made in the USA it measures 12"w x 4.25"d x 16"h.