The advantages to this cage are many over any other style cage. They will easily slide between the frames and not cause burr comb to be built. Much more communication area is available. Each cage is impregnated with a pheromone to aid in acceptance. There is an additional break out bar in the bottom to allow worker bees to enter (put a little candy over this hole to delay entry for one day). There is even a hiding place for the queen to avoid hostile bees. Try these...you will love them!