The Penn-Plax Action-Air Diver with Treasure Chest Aquarium Ornament is a colorful and fun addition to any aquarium. This air-driven ornament from the Action-Air Jewel-Box Collection features real underwater movement, adding an extra element of entertainment to your tank. Made of durable plastic, this ornament is suitable for all water types and is sure to provide hours of enjoyment for both you and your aquatic pets.