The Deep Blue Professional Coral Concepts Coral Reef Rock #2 is a stunning piece of artificial reef rock that closely mimics the look and texture of natural coral reefs. This durable poly resin construction ensures it will withstand the conditions in any saltwater aquarium environment without deteriorating or leaching harmful chemicals, making it completely inert and safe for all aquatic life. With dimensions measuring 8 inches by 5 inches by 4 inches, this rock allows hobbyists to easily build intricate reef structures that enhance both aesthetics and biological filtration within their tanks.