Crafted to resemble algae-encrusted live rock, these resin material Frag Rock mounts offer a beautiful alternative frag racks. Eliminate unappealing visual confusion and keep your reef display aquarium from looking like an incomplete, "work in progress" propagation tank. Frag Rock offers a space-saving solution to your coral propagation needs. Realistic Frag Rock measures 3-1/2" diameter x 1-1/2" high and includes 5 frag plugs, which are perfect for nano reef aquariums.