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/White MOP Shell Blanks, 18L, White+White, 2.5MM thick