Recirculating sand adds instant intrigue and excitement to any aquarium. These beautifully hand-crafted resins and magic-like action bring any tank to life. The resin comes with tubing, air stones, and glistening sand.From the manufacturer:PENN-PLAX is a family-owned business that was established in 1956 in Brooklyn, New York. Over the years, our goal has remained the same: to enhance the pet ownership experience.We specialize in creating excellent pet supplies for animals, both great and small. We're best known for producing pet products at affordable prices. Our brand is synonymous with innovation and quality, keeping your pet foremost in mind.