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 shells, 18l, 2_5mm thick, white+white