This item is for various forms of "soft" coralline. Soft coralline is the hobby term for many different species of thin branched coralline algae that is fairly brittle. They are similar or members of the Amphiroa genus. Sold per plant, they are small, about 2 cubic inches or so. These species require bright lighting, and moderate to lower flow. Additionally they require good calcium, pH and alkalinity levels. A table of "ideal" water parameters can be found below, but like most things in this hobby a degree of deviation is tolerable:
These species ship better with Express Mail.