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. Each package has detailed usage instructions on it as well making them great for resale.