These ashtrays were made by Fostoria Glass between 1938 and 1944. They are the spool pattern and they stack one inside the other. The largest of the group measures 5 1/2 inches, the middle one 4 1/4 inches and the smallest one 3 1/4 inches. These are outside measurements. The inside measurements are 1/2 inch smaller. I mention this because these ashtrays would make a wonderful base for three like candles in an arrangement on a table or mantle. They are really beautiful.