Takashima Black Mother of Pearl Buttons,(Black Lip Oyster)#00017JK Four-Hole,15mm(5/8'')8Pieces&20mm(13/16'')3Pieces Suit Buttons Set Made in japan These buttons are made of genuine black mother of pearl Sold in set of 11 buttons- 3 large 20mm(about 3/4") and 8 small 15mm(about5/8") Made exclusively for Takashima Buttons for men's suits or blazers