A perfect Seal, Adjustable Bottle Stopper. With a simple twist of the wrist this The Perfect Seal, Adjustable Bottle Stopper gives an airtight seal. Lay your bottle on its side or even turn it upside down without leaking. Just twist the top and the neoprene sleeve inside the bottle's neck expands to make an airtight seal. A quick reverse twist unseals the stopper for easy removal. the stopper inserts completely inside the bottle for a low profile appearance. Expands from .6" to .8" to work on many bottle styles. Stainless steel and chrome plated components. As with all of our other"themed" based wine stoppers, these new adjustable stoppers can be ordered with your choice of wood (Cocobolo, Botoce or canarywood) and insert. We tried these new stoppers on a opened bottle of champane. After two weeks we re-opened the bottle and were amazed at how well it kept the contents fresh and bubbly. These have the best seal that we have found so far.