TWENTY FIVE (25) DOUBLE THICK SMALL AKOYA MOTHER OF PEARL SHELL BUTTONS SIZE: 18L = 11MM (7/16 inches) COLOR: Smoke Brand new buttons. Please note these beautiful buttons are handmade out of shell and differ in texture and thickness with natural color variations, although size of circle is uniform at the 18L size of 11mm. These are the double thick version of the shell buttons, not the super thin that tend to crack easily. This size is a pretty standard size for a button down shirt. You will receive 25 new buttons not necessarily the exact buttons shown in pics.