Vina Wine Bottle Stopper with Vacuum Pump Sealer, Pumping Fresh Wine Stopper for Wine Air-Tight Storage, Blue Feature: All in one wine stopper with built in vacuum pump, this wine bottle stoppers provide an air-tight seal to prolong and preserve opened bottles of wine. Easy to use: Our vacuum wine sealer is a hand operated pump. Simply cap an opened bottle with one of the stoppers and then place the pump over the stopper and start pumping the air out until resistance. Principle: Keeps wine fresh by removing all air from bottle, making bottle air tight. Material: Made with Aluminum alloy, PC, and sillcione. Function: Long lifetime, great for home use and gift for friends.