The Oceans Wonders Ceramic Coralline Purple Coral Frag Plugs are direct replacements for the frag plugs in your Oceans Wonders MAG Rack and Frag HUBS. These plugs are made of ceramic material that is non-curing and easy to clean. The purple color of these plugs matches the purple color of the Oceans Wonders MAG Rack and Frag HUBS. These plugs are compatible with all Oceans Wonders frag holders and will maximize the space in your car. These plugs are also Amazon exclusive and are only available through Amazon.