Come and see our amazing products. This stopper uses a simple but brilliant physics principle (Pascal's Law). As pressure builds inside the bottle, the nodule expands outward, creating a 'bubble-tight' seal. Lay your bottle flat, or stand it upright and the seal works the same. BPA and Phthalate Free.The shape of the bottle can be anything - if the neck is a standard 750ml Champagne or Sparkling Wine bottle neck (and we all know what that looks like), then this Champagne preserver will fit. It can be used for Prosecco, Cava, some Magnum and 187ml bottles, and many large format beer or cider bottles. Pls confirm with us about the packing info, stock color and exact production time before placing your order.