Wine can be preserved for up to 2 weeks after pumping air out with this vacuum stopper! Pumping out the air keeps wine from oxidation. Simply place it on top of an opened wine bottle,  press down on the vacuum sealer several times until it stays compressed and doesn't pop up. To remove, lift the stopper to release the seal, and enjoy fresh wine. Works on all standard size wine bottles. Made of acrylic and silicone. Approximate dimentions are 1.75 inches in diameter by 2.75 inches in height. This is a great gift for wine lovers, and an essential item for the home of anyone who enjoys wine. Each stopper is boxed for easy gift wrapping. You choose from green/blue, red/yellow or blue/pink.