This core consists of a nest, 2 small doors, one in front and one behind the nest, has 2 paraffin-coated hollow covers, with a central chimney above. A masonite cover is placed on top of the hatch cover; as a closure there is an electro-welded roof covering both hatch covers. A sheet metal sheet separates the two compartments. The wooden bottom has a hole in the center covered with expanded metal sheet for ventilation. METHOD OF USE: You must open the frame and replace it with a frame inside the Beehive. Leave it long enough for your family to allow the brood to settle and transfer it to the Nucleus hive free work along with some bees. They, noting the absence of a queen bee, will make their own cell. For each frame you need to repeat the same procedure. At the end of the treatment you will have your 2 mini-nuclei with fertilized queen. Only recommendation: keep the Nucleus hive 3 km. away from the apiary or closed 2 days.