Round Freshwater Shell Tiles with crystal 1.diameter of each shell,30mm,25mm,20mm 2.OEM ... Magnesium oxide board; Features:1).The first OEM shell mosaic factory,we only product all kinds of shell mosaic; 2).Fast ... 15days depend on quantities, 3). Stronge ability:We have two factory,can meet your any needs; 4).OEM,small,customized ,testing ... your cost and time! Round Freshwater Shell Tiles with crystal