The Vacuum Stoppers are designed to preserve the flavour and taste of wine via the creation of an airtight vacuum This inhibits the oxidation process that is responsible for spoilage The device is simply inserted into the neck of an opened wine bottle when required Although they are most effective when used alongside s various Wine Saver Pumps the Vacuum Stoppers can also be used in isolation The Stoppers are constructed from high quality food approved rubber that is dishwasher safe They are extremely robust and will tolerate regular and prolonged usage The cap on the top of the stoppers can be removed in order to aid cleaning As well as the traditional grey version the set of 6 can also be purchased in alternative bright colors 2 x pink 2 x blue and 2 x purple Features . Set of 6 Wine Saver Vacuum Stoppers made from high quality food approved rubber. Easy to insert after the cork has been removed from the bottle. Preserves wine via the creation of an airtight vacuum. Can be used with or without s various award winning Wine Saver Pumps. Washable by hand or in a dishwasher and reusable. Suitable for all but sparkling wines. Award winning product used in over 35 million households and more than 80 countries throughout the world Specifications . Weight 0 31 lbs