Nothing is worse than finding all your virgin queens dead due to a early hatching queen who killed them. One of the best features of the Nicot system is it is unlickely to happen because all the eggs are almost the same exact age. There are only 110 cells for the queen to lay in so she does it very quickly and all the eggs are within a few hours of being the same age. As soon as the queen cells are sealed a cell protector cage can be fitted over them so as to insure protection of the cell or containment of the newly hatched virgin. The cages can be further used for traveling and introduction. Sold in packs of (10).