You may wonder about this bright lime green Plastic Frame and Foundation, but it is a very good idea. It is bright green so you can immediately distinguish it from the rest and because the cells are Drone size you will have nothing but Drone comb on it to trap those pesky Varroa Mites. When it is full, just remove it and scrape the comb off, discard and place back in the brood chamber for more.
When raising queens you can also increase your drone populations to insure the genetic diversity required for well mated queens. 9 1/8" size.