... 20×20mm,production Thickness8mmShell Size(mm)300*300 or othersColornature shell colorShapeSquare , rectangle , irregularFeaturesenvironmental , no harm to bodyno ... shells, such as mop shell, ablone shell, Chinese river shell, black MOP , yellow MOP , pink Shell, pen Shell etc. 8) Processing technic ... for future business relationships and mutual success! Coconut shell mosaics seaside shell mosaic