The wine aerator is made of stainless steel and is accompanied by a filter which will prevent loose bits of cork and other sediment from reaching your decanter or glass. Pouring wine through an aerator allows it to breathe, giving it exposure to the surrounding air. This aerator has little holes at its base so the wine is forced through them and this pushes the liquid to the side of the glass decanter or carafe, exposing the wine to an increased surface area, allowing more air to come into contact with the wine. Super Oxygenating funnel for wine decanters & aerating Polished stainless steel