Live premium rock that's still ALIVE with all the beneficial creatures that you buy live rock for in the first place. Sponges growing on many of the rocks. I've kept it alive in a large tub in my garage with circulation and heater after tearing down my 75g tank. No bad algae or aiptasia on it (it's been in the dark for a month). $2 per pound or best offer. This was enough for my 75g tank to fill about half way up the tank. Pieces of all sizes. Bring your own bucket/tub.