I have had too many to remember any of them now. They just become habit. Oh, I do remember one just recently. I have 4 or 5 pieces of mat I cut from a 24x36" mat I ruined years ago buy leaving an iron set on it. I realized cutting small quilt pieces and trimming blocks that I could lay one of these pieces ontop of my large cutting mat. I was shocked my rotary blades cut much better and last longer. I don't always need a larger cutting area. The smaller mats are a lot cheaper too.