... to 10-100cm; natural stone,non-polluting; 3,000mt/month ISO9001-2000 certified company Pumice Character,1), Light in ... weight, high in hardness;2), Natural stone,non-polluting, non- ... instead of ceramicite,haycite etc.2), Landscape: Big pumice arts can be put in garden or yard as ... 's request.Shipping: By container or truck Pumice stone