Welcome to our storeMaterial: environmental silicone.Color・red/orange/green/purple/yellowSize: diameter is about 10cmHarmless and a nice decoration for your fish tankPackage includes 1 * coral ornament.hese corals will ba a best choice to decorate your fish tank. They will make your fish tank more beautiful and vivifying. They provide a place for the attachment of nitrobacterias. You can put them into you fish tank directly and you can also plant them into the sand of the tank