They are great! Heavy enough the big snakes can't haul them around too much, they seem to like that big flat roof to laze about on or hunt from, easy as heck to clean and nice and dark inside for the snakes. I had to have my husband cut through them with wire snips....no way is my grip strong enough LOL. Like you say...the nice thing is when you cut into them...there's no jagged edges. I'm thinking one of those drill thingies might work better, to put a big round hole in the roof (what in the heck are they called????)

I need to hit the feed store here in Toledo as we bought ours up in northern MI and I sure hope I can find more locally.