These are (2) two large ( 1 - 1/4 inch square) MOTHER of PEARL (abalone shell) BUTTONS. They are uniquely beautiful as the rainbow of colors-- aurora borealis--like the northern lights gleam in the light. If you set out to find buttons like these, I think it would be a miracle to find others this spectacular. They are not just flat, but 3 dimensional and sure to get comments/compliments. Due to their uniqueness they are essentially the same size to be used together, but not exactly the same--not "cookie cutter". If you've been looking for special buttons for that jacket, dress or blouse, look no further--you've found it here!