Pigeon mountain trading companies duragilt foundations are made with a clear sheet of plastic that has a coating of pure beeswax on each side. Plastic and wax are embellished with hexagonal worker cells. These foundations do not require extra support since the metal edges extend into the top bar of the frame and the groove of the bottom bar. The lower edges of the foundation contain the communication holes. This foundation works best with grooved bottom bars. Sold in quantity of 25.