... 3.Size: 10-20mm 4.Finishing: polished Pebble, pebble stone, beach pebbles, river pebble, decorative pebbles, pebble wash, garden pebbles.Description as ... follow: ProductBlack Natural River Pebble StoneColormixed, white, black, green, red, yellow, pink, etc.Size6 ... 20 days or meet the time you need Black Natural River Pebble Stone