The Blush 842094162840 Mirage Iridescent Champagne Stopper is a bottle closure accessory designed to seal opened sparkling wine bottles. Its stopper mechanism fits into the bottle opening to restrict air exchange and retain carbonation between servings. The iridescent exterior creates a shifting color appearance under different lighting conditions. To use it, position the stopper over the bottle neck and press it securely into place according to its closure design.