... , Chinese river shell, freshwater shell, freshwater MOP shell etcBacking of shell Mosaic:Mesh,Ceramic,Porcelain, aluminium honey comb,PVC,MDF ... : Shell mosaics& shell tiles are widely used in shell decoration of hotels, villas, bars, office houses, furniture, company halls, recreation ... to clean the products to keep the luster. The mohs hardness of shell is about 2.6 scraping by sharp things should ...