Black & White Multilayer StoneBlack and White Multilayer (Thin Layer) Stone comes with random shapes & sizes. It is a natural stone that is safe for use in aquariums, terrariums, and all other small pet enclosures, including small mammals and birds. Colors are even deeper when misted or underwater. Note: As with any natural rock, pieces come in various shapes and slight variety in color shades. For further details, call our customer service before placing an order.