1. This Ceramic Shelter Decoration are made of premium materials that are safe and gentle to the fish and other plants in your tank. The Ceramic Shelter Decoration are made of ceramic, a durable and long-lasting material that is safe for aquatic use. 2. The versatility of ceramic shelter decorations makes them a perfect addition to any aquarium, regardless of its size or style. Whether you have a small shrimp tank or a large tropical aquarium, these decorations can be seamlessly integrated into your aquatic environment.