card board nuc's are mainly for shipping or selling nuc's (keep you from getting rid of your wooded boxes), being wax coated they can take some weather but not a lot, remember they are made of paper, I have heard some use them for swarm boxes but have some protection over them, I have never tried one, they might work but I want take the chance.. I dont sell my nuc's, I tell the buyer to bring his own equipment and he gets 5 frames with the queen.