The case comes with 12 packs of replacement cartridges packaged for retail resale. Each pack contains 2 cartridges.
ZOS HALO comes with one cartridge. We recommend purchasing replacement cartridges to keep on hand. Each cartridge lasts about 5-15 bottles with proper use. Cartridges are filled with a non-toxic material that absorbs all the oxygen and preserves your opened bottles of wine for up to 2 months. ZOS Halo sold separately.