Beeswax Double Coated Black Plastic Foundation is an Injected molded plastic raised cell sheet. Coated with 100% USA beeswax to help the bees start drawing the cells. Fits 9 1/8 inch frames Foundation size is 8 3/8 inches x 16 3/4 inches. Used with wedge top bar or grooved top bar frames. The black color helps beekeepers see the eggs in the cells, allowing them to watch the brood laying pattern of the queen.