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It is a sheet with little holes to put in the bottom of the cores for ventilation, it is usually placed perpendicular to the frames along the entire length of the bottom, it is perforated in the center and at the ends without drilling to be able to nail with a stapler or hand. Available in the following sizes: -Length 215mm (5-frame langstroth or dadant core). -Length 250mm (6 frame langstroth or dadant core). -Length 275mm (core layens of 6 frames). Consult other measures.