gravel cobblestone 1.nature texture 2.no radiation&non-pollution 3.customize size and color 4.prompt delivery cobblestone The pebbles are natural, non-polution, environment friendly, and are widely used for interior and exterior wall cladding, road paving, landcaping, ect.Features 1.finished: natural, machin-made2.country of origin: superior quality quarry of China3.size: diam:8-15mm; according ...