Check the listing for details. 4 PCS Plastic Queen Excluder 10 Frame Queen Bee Excluder Langstroth Hives. Color: yellow, Condition: New. Listed at 32.99 USD. Queen bee Excluder Plastic - Pack of 4, Beekeeping Tools, Fits for 10 Frame Langstroth Hives, Separating Queen Bee from Honey Making Area (Square Hole) Features & details The function of Queen excluder is to make queen stay in the lower hive instead of entering the honey collecting area of the worker bees in the upper hive, so as to keep the hive in order and make worker bees convenient to collect honey. The smooth oval gap design and circular edge make this beekeeping queen excluder safe and convenient for bees to pass through the eliminator without scratching their legs and wings, thus improving the efficiency of honey brewing. With this plastic queen Excluder, queens and worker bees keep in order in all areas of the bee hive, performing their daily tasks of honey brewing, spawning, and royal jelly production. I have ten years of beekeeping experience, I recommend this queen bee Excluder, which is suitable for all 10 frame double or multi-layer Langstroth hives and convenient to use.