Kitchen Craft Bar Craft Connoisseur Deluxe Wine Aerator and Breather The Wine-Stone at the end of the extended tube is not really a stone but a valve. Comes with a wall hanger. 12-1/4L, 2-1/8 W at pump. Features a pump action to gently release air bubbles To use with bottle, insert the Wine-Stone into the wine bottle. Pump ever so slowly no more than 2 or 3 times. To use with glass, pump only once. That is just enough to soften the tannins and bring out the natural flavor inherent to the wine. It is a specially formulated perforated and processed, pure 18-10 stainless steel module that refines the air pumped in into very tiny bubbles. The valve is food safe and free from the possibility of oxidation, corrosion, rust, stain, odor or coloration.