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Type 2 polystyrene queen fertilization core (Kieler) Made of high-density polystyrene. With four frames on which the wax is fixed. With compartment, two adjustable outlets, one front and one bottom. At the bottom there is a kind of sliding piece that regulates ventilation with the possibility of opening and closing the exit of the bees to the outside. The same piece of plastic from the bottom that can be removed when you want to fill the nucleus with bees or when you want to introduce a fertilized queen into an orphan hive, can be done from the bottom or from the top. Supplied per unit and in boxes of 27 units.