The starter bundle comes with a ZOS Halo wine saver and five cartridges.

THE EASIEST WAY TO SAVE OPEN BOTTLES OF WINE FOR WEEKS

• Simply Insert Oxygen Absorbing Stopper into Bottle. 
• No Pumping.  No Gas. 
• Stops Wine Oxidation.
• Open Bottles Last up to 60 Days
• Fits most bottle neck sizes including screw tops and corked

ZOS is a wine stopper that absorbs oxygen.  When your wine is exposed to oxygen, the delicate flavors and aromas are damaged.  By simply inserting the ZOS stopper into your open bottle, it’s oxygen-absorbing cartridge automatically removes 100% of the oxygen that damages wine.  So the last glass will taste just as good as the first.