Inner covers are used in colder climates and seasons. We use our inner covers in fall & winter and top screens in spring & summer. Notched inner covers provide for better ventilation than flat panel inner covers. Raised-panel style with about 1/8” recess on the one side and 3/8” on the other side. Corners are tenoned and plywood is 1/4” luann with the standard cutout in the center for a bee escape. Available for 10 Frame, 8 Frame, and 5 Frame (nuc) hives.