Oceans Wonders Ceramic Coral Frag Plugs are perfect for the propagation or fragging of hard and soft branching corals such as Acropora, Birdsnest, Montipora, Kenya Trees, Xenia, ect. They have a 3/4″ crown with a 7/16″ base and fit perfectly into standard eggcrate or into small cracks or crevices in live rock. Ceramic frag mounts are fired at nearly 2000 degrees in a high temperature kiln making them 100% inert and safe.  They never have to be cured and are shipped dry, ready to use.