The queen rearing bar works in two positions. On one side it has 13 cells (bee queen rearing) and on the other 40 (royal jelly). Incorporating cells on which you can perform grafting directly (for royal jelly). Special detachable cells are applied onto the bar and facilitate bee queen rearing, while special protectors can be fixed on the cells to prevent interaction between the queens. These protectors can also be used as cages to transport/introduce queens.