The Champagne stopper is constructed of tough, rust-resistant stainless steel. Easy to Clean and reuseble, provide an air-tight seal to prolong and preserve opened bottles of Champagne. Designed to fit all kind of champagne bottles, keeps open bottles of sparkling wine fresh and flavorful for 7 days. Website: https://www.cheerfastwine.com/Wine-Stopper/1609.html