The largest is 4" x 6" The smallest is a tiny 1/4" x 21/2". With so many dies in the set there are plenty to chose from. Be aware that they are narrow compared to some standard rectangles. They do not correspond to standard card sizes, so they are not good for matting in card making. However they can be just right to fit in odd spaces and sometimes as a base for wording that might not fit into other dies. I have not been working on my scrapbooks for a while, but I think they may be useful in layouts and cropping photos.