Purchased for Brew N go single cup coffee maker, the filters are great quality.The size 1 filters are just a little small for the coffee filter and the size 3 are too big, I guess its something we have to deal with. The size is not an issue unless you decide to load up on coffee for a very strong brew.Would I buy it again... Not sure, I might stick with the next size and fold them a little at the bottom and sides to make it fit perfectly.