They come in two sizes: 100ml and 180 ml. To aerate and decant - just invert the bottle, fill the bowl with wine, then tip the wine into the glass via the outlet pipe. Works well on young tannic reds - oxygenating without the hassle of filling, emptying a larger flask.
Chad is now importing and has these online in NZ - see here
he has distribution throughout NZ. Tomorrow - the World!!