Bought 3 boxes of these steel wool strips to use at my coastal home in Maine, specifically for closing gaps and holes that the mice use to gain entry to basement of house, and also into our pop-up camper. Easy to use, much better than steel wool pads. However, the add specifically states BRASS wool. This is not brass wool. This is steel wool that will rust in damp locations, and humid salt air. I should've checked the contents of the boxes when I first received them and would've had time to exchange, but this is about a misleading description of the item.