These are hand built cedar carpenter bee traps. Traps are built out of solid cedar which the carpenter bees tend to prefer a softer wood like cedar then other types of wood. These are made by one of our local consignors. They are all nailed and glued together to ensure a long lasting product, that will perform season after season and not fall apart. You can unscrew the mason jar to empty the bees out and/or relocate them.