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Type 4 Eco polystyrene queen fertilization core. Made of high density and hardness gray expanded polystyrene foam. It is a copy of the apidea kernel but cheaper. Compatible with apidea and apidea parts. In the front part 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 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 orphan hive. A queen excluder in the food chamber (with plenty of space) ensures that the bees do not build in this space separating the chamber from the feeding compartment. Contains 3 plastic slats or frames to install the stamped wax. Spout with gate closure and vents, one at the bottom and one at the front. Supplied per unit and in boxes of 18 units.