... 10-20mm 20-30mm 30-50mm 100% natural pebble stonePebble style:polished,highly polishedPebble color:blackPebble size5mm-12mm ... cobble stones, polished pebbles,river stones, river rocks,pebble mosaic,pebble tiles, mesh pebble flooring tile , multicolored cobble stones, agate stone ... , garden pebbles, filter materials, quartz sand and other pebble stone products, all of which are commonly used for ...