It is basically a rubbery sachet, which is dropped into the bottle. It swims on and covers the wine, thereby eliminating contact with air. I was initially skeptical, as it was a bit difficult to place the sachets correctly into the bottle and it did not seem to cover the surface tightly up to the bottle wall. However, the results were good. I tasted this on the Hanisch wines (see post below), and they were just as fresh on the second day, which is a good result for wines up to nine years old. I will continue to drink these wines on day three and four, and it looks like they will still be good.
The product does not look all that nice in the bottle, but it allows me to do vertical tastings or other comparisons with only two people drinking the wine over time. It will be very suitable for restaurants. I believe pricing will be about $1 per sachet. I noticed Michael Twelftree of Two Hands is quite a fan.