River pebble stone Many colors are available High quality Shipment ... 0.2%Bulk density1.85g/cm3 For decolorization stone: 1Typecobble & pebble (river stone)2Material100% natural stone3Usagelandscaping, paving, building, home ... decoration4Product class rangeunpolished pebble(super class, first class, second class)5Size Range1~3cm, 3 ...