Oceans Wonders NEW Flush Fit Coral FRAG HUBS are perfect for safely holding all of your frags in one convenient spot in your aquarium. Our frag hubs are available in a variety of sizes with 5, 10 or 20 holes. They are made from the same material as our popular ceramic frag plugs and are fired at nearly 2000 degrees in a high temperature kiln making them 100% inert and safe for your reef. They never have to be cured and are shipped dry, ready to use. A textured surface helps speed the spread of coralline algae and give each hub a more natural look in your aquarium.