Saim Aquarium Plastic Resin Castle Ornament Live Action Aerating Fish Tank Decoration Made of quality plastic and resin,durable and long lasting. Absolutely safe for fish and your aquarium. Real motion air-driven ornaments provide entertaining action while aerating your tank. Requires air pump & tubing (not included). Pressure control valve recommended. Size measures about: 4.7" x 4.6" x 5"(L*W*H)