... 3.customize size and color 4.prompt delivery river stone The pebbles are natural, non-polution, environment friendly, ... radiation,environmental friendly,waterproof 4.usage: garden,on the front porch,bridge,interior and exterior decoration, etc 5.adornment ... over 10 years, with rich experience to control the best quality. 2. Good Cooperation and Good Price ... 3. Lead Time is soon and on time. river stone