Built exactly the same as traditional AŽ frames, our AŽ-Langstroth beech frames feature concave top and bottom rails, beautiful box joint construction, and are pre-drilled for wire. They feature grooves to accommodate your plastic foundation in the top and bottom rail. Use wax foundation, or your favorite Langstroth foundation, to easily snap in and be ready for bees in seconds. Sold in packages of 30. Foundation not included.