... 12mm,15mm,20mm, 30mm, according to your demand. 3) Packing: Wooden case4) Colors: Various colors for chosen, especially we ... any pollution and radiation, thus is an environmental friendly building material.High hardness, the Moh's hardness reaches to 6 ... discoloration, fading.Durable and maintenance free.Environmental friendly building materials not contain any pollution and radiation Artificial Stone ...