Can't finish the whole bottle? Preserve the freshness and flavor of a bottle of opened wine with this clever vacuum pump. No extra tools are needed. Simply place the stopper into the opening of bottle, pump, set the date and keep it fresh. Vacuum seal slows down the oxidation process allowing opened bottles to last longer. Use the dial on top to set the date. Sold as a set of 2. What's it made of?hard plastic How does it come?in a pack of two. Each pump measures approx. 6 x 3cm