All coral fragments we offer are mounted on frag plugs for secure placement in your reef aquarium. Frag plug type differs from supplier to supplier. Use our handy frag plug guide for easy reference. Drs. Foster and Smith (DFS) Fired ceramic   Drs. Foster and Smith (DFS) Fired ceramic     Fish Heads, Inc. (FHI) Epoxy Maricultured: Bali, Jakarta, Fiji, Solomon, Tonga & Vanuatu Bases Aragonite and concrete     Oceans, Reefs & Aquariums™ (ORA™) Aragonite block Oceans, Reefs & Aquariums™ (ORA™) Plastic plug     Oceans, Reefs & Aquariums™ (ORA™) Epoxy Scientific Corals (SC) Aragonite and concrete     The Coral Nursery (TCN) Sand and concrete