The Aqua Della aquarium ornaments are made of non-toxic, high quality polyester-resin, guaranteed not to upset the biological equilibrium of your aquarium. Available in wide variety of designs, the life-like detail will add interest and drama to any aquarium. Key Features : Made of high quality, durable polyester-resin Suitable for freshwater and saltwater tanks Detailed and life-like Absolutely non-toxic for fish and plants No influence on the biological equilibrium pH-neutral Ornament dimensions : 7 - 10 cm