JCs Wildlife Bat House approved Bat Conservation,Single Chamber holds 100 bats Single Chamber Bat House holds 100 bats and approved by the Organization for Bat Conservation Hand-Made of cedar with recycled black poly-wood back and weather resistant screws and sealed joints. The recycled poly-wood is crack and fade-resistant and will hold up better and longer than the standard plywood backing. Finger grooves engraved into the poly-wood provide a place for the bats to grasp for easy entry and will not wrinkle or tear like the standard netting. Black poly-wood also provides the dark chamber bats prefer. Proudly made in the USA.