Leaf Cutter Bees are Summer Pollinators for vegetables and flowers in gardens. You will receive a box filled with approximately 150 bees in the filled rows of holes with the remaining 55 empty holes ready for nesting bees. The box easily comes apart when you harvest your cocoons and it is reusable every year when cleaned out after harvesting the cocoons. Filled boxes will be available in late Spring. Empty boxes (separate item on website) are available now.