CDU holds 48 single wine caps to reseal your wine so you can lay open bottles on their side without leaking & fit them in the fridge door. They wholesale for $2.50 per units & retail for $5 a piece - Available in six styles - Medicate, Save water, drink wine, Pour, drink, repeat, more wine, less whine, WTF (wine time finally) do I really need a clock to tell me when I can drink.