Four cups of clean pest free chaeto with an integrated copepod culture. Enough biomass to make a refugium work on day one instead of waiting months for a softball to grow. Everything is cultured in house in Vermilion, Ohio and bottled fresh the morning it ships. Orders go out Monday through Wednesday only so nothing sits with a carrier over the weekend. 100% live arrival guarantee, if anything shows up DOA I reship it free, no photos or claim forms needed.