This is the same great Helix floating biological media used in the Helix Moving Bed Waterfall Filter and the Helix Bio Mechanical Reactor. It's floating media at its best! Shipped free in a plain white box.
For those who wish to know, a conservative figure of the SSA (Specific Surface Area) of the Helix media is 550. In propertly submersed and aerated conditions up to 900 is common.