Takashima Black Mother of Pearl Buttons Buttons,(Black Lip Oyster)#BT131 Four-Hole, 9mm(3/8'')5Pieces&10mm(3/8'')15Pieces Made in japan These buttons are made of genuine black mother of pearl Sold in set of 20 buttons- 15pcs 10mm(about 3/8") and 5pcs 9mm(about3/8") Buttons for shirts,blouses