SAFE MATERIAL: Made from non-toxic resin material that is flexible and realistic. COLORFUL & VIVID: Artificial castle design, turn the fish tank into the beautiful scenery. HIGH QUALITY: Completely safe for fish, they won’t die, rot or cause algae problems. Rinse several times with clear water before first use. Offer your fish a great hiding place. Suitable for use in saltwater and freshwater. PRACTICAL DESIGN: Ideal for reptiles such as lizards, turtles, spiders, snakes, centipedes, scorpions, frogs, fish, etc.