Kent asked if bees propolize these boards. They do not. Frankly, I never thought why not. Perhaps because they are on the bottom? Kent also asked for more detail concerning how I make the boards. Here is a copy of a reply I sent to a private inquiry. Based solely on catalog pictures, the Dadant and Kelley screens look identical. Note that the following referred to 1/2" hardware cloth. New boards that I make will use 1/8" hardware cloth. "I take an 1 inch thick board which, of course, actually measures 3/4". I rip that into 1 inch strips. I then cross-cut those into 20" and 16" pieces. I cut lap joints into both ends of the 16" pieces and one end of the 20" pieces. I then put one 16" piece and two 20" pieces onto a jig I made that exactly fits outside a hive. The lap joints from the 20" pieces fit those on the 16" piece. I put a bead of glue on top of the strips, and then lay a piece of 1/2" hardware cloth on top and staple it down. Then I put another set of strips on top of the wire, and drive nails through and into the strip below. This gives me a 20" X 16" piece of hardware cloth supported by the strips. The setup is set on my hive stand in same manner as a bottom board, and the lower hive body sits on top of the setup. The end without a set of 16" strips provides a lower entrance into the hive. I hope this helps." Lloyd Lloyd Spear, Owner, Ross Rounds, Inc. The finest in comb honey production. www.rossrounds.com