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Fertilization nucleus of type 1 polystyrene queens (The API nucleus). Constructed of high density polystyrene. In the front part there is a kind of sliding piece that regulates the ventilation with the possibility of opening and closing the exit of the bees to the outside. The bottom has another piece of plastic that can be removed when you want to fill the nucleus with bees or when you want to introduce a fertilized queen into an orphaned hive. A queen excluder in the food chamber (with plenty of space) ensures that bees do not build in this space. Contains 3 plastic strips or frames to install the stamped wax. Entry gate with gate closure and ventilation grills, one at the bottom and one at the front. Plastic backing not included. Supplied individually and in boxes of 24 units.