Champagne corks with pump. The built-in improved pump-piston system increases the pressure in the bottle more efficiently than these basic types, so it will keep your sparkling wine chilled and sparkling to the last drop. PROFESSIONAL PREPARATION - Insert the champagne holder into the bottle, fold down the hinged flap to lock the bottom lip of the bottle and press the button until you feel a strong resistance, indicating closure hermetic. PREMIUM SEAL STOPPERS - Our champagne stoppers are made of high quality stainless steel and ABS - so you can count on them over the long term to give you the best results: tight and airtight seal! It is also very easy to clean and is dishwasher safe. Excellent value for money and perfect gift - by giving away a pack of 2 champagne protectors