The all-in-one wine bottle sealer built in vacuum preserver pump, will remove virtually all the air from the wine bottle. Operation is incredibly simple - insert the stopper and push it down as far as it goes tightly inside the bottle, and pull the top lever up and down, to pump the air out until you feel some resistance, and your done! The wine saver vacuum pump will extract the air from an opened wine bottle. This slows down the oxidation process and keeps the wine fresh for 7-10 days. The new wine vacuum pump stopper all-in-one combination is small, handy, efficient, and cost effective way to preserve your favorite wines. Keeps red and white wine fresh much longer by removing all air from bottle. Materials : Aluminum alloy, PC, and silicon Food Grade.