NWOT Wine Sipper Glasses. Set of 2 acrylic glasses. Boxed in original carton and ready for your next party or gift giving. (300ml) Wine sipper glasses, or "port pipes," are specialized 17th-century style, hand-blown glasses designed to enhance port wine by allowing the drinker to sip from the bottom of the bowl through a hollow stem. This design minimizes oxidation, as the drinker consumes the less-exposed wine first, while the small, bowl-shaped vessel allows hand-warming of the drink.