... 3.Black,white,brown color 4.Size:12x12,20x20,16x13.5,15x15cm Natural Pebble River StoneSpecification1Typecobble & pebble (river stone)2Material100% natural ... class, first class, second class)5Size Range1~3cm, 3~5cm, 5~8cm, 8~12cm6Color Availableblack, yellow, red, green, gray, white, mixed ...