If this is the foundation I think it is, the frames come as a single "pre-fab" unit, frame and foundation, with the foundation part of the frame coated with a light layer of beeswax. I bought a couple to try (samples) this year, but haven't installed them yet. They're *very* expensive, by the way, so unless you want to use them as a permanent fixture in the brood body, you might want to take this into account. They're also a kind of funky (seems flimsy) shape, compared to standard wood frames. Does anyone know how well they work out in an extractor? I'm only a hobby beekeeper, so it's no biggie with me. --Jane Beckman [[log in to unmask]]