It's about that time in Portland, Oregon to get mouse guards on to hives. I lost a couple Warre hives a few years ago because I forgot to get guards on. When I went to check them the next spring I found this:

Previously I've just used 3/8" hardware cloth stapled over the entrances. This works totally fine and is very inexpensive! But due to the overwhelming number of requests, we've begun producing stainless steel mouse guards if you're interested.