The Bubble Indicator from the French brand L'Atelier du Vin is the perfect accessory to prevent champagne and sparkling wines from losing their flavour and bubbles. The Bubble Indicator is easy to use and effective. The stopper maintains the pressure in the bottle, while a sensitive indicator shows changes in pressure. When the coloured ring on the stopper slowly starts to disappear, it's time to close the bottle - no fuss, no guesswork, just efficiency. The Bubble Indicator® is a stylish, smart and patent-pending product.