These are little treasure boxes that I purchased at Sanybel's Finest. They measure 5 3/8" wide. All of the little bitty shells go in there for safe keeping. :-) One box has shells from 1" to 1/2" in size. The other one has even smaller shells, 1/2" to 1/16". I think I love these little shells more than any because they are more difficult to find, due to their size.