"Create a brilliant under water garden within minutes using this instant crystal growing kit. These multi-colored magic rocks can grow up to 4"" in height to create a beautifully colorful underwater world. This magic rocks kit is recommended for children 12 years and older. Contents: 0.44 oz. (12.4 g) Magic Rocks, 2.4 fl. oz. (133 ml) sodium silicate, 1 space background print, 1 sticker sheet, 1 aquarium, Instructions"