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An 8 Frame IPM Board, or Integrated Pest Management Board, is used to help you determine the amount of mites in your colony. It is composed of a screen bottom with rails mounted underneath so you can slide in a sticky board (included.) Cover the sticky board with something like Pam, WD-40 or Vaseline so the mites stick to it. Sticky boards are made of corrugated plastic and can be washed and re-used.
You can also use the rails to slide in plywood during the winter to close up your hive, without having to switch bottom boards.