Grinded Black/White Mother of Pearl/MOP Shell Blanks/MOP Blanks/MOP Shell Buttons Blanks and Grinded Troca/Trocas/Trochus Shell Blanks and Troca/Trocas/Trochus Blanks and Troca/Trocas/Trochus Shell Buttons Blanks/trocas shell blanks-16l, yoko, 2_2mm thick