For the brown lovers. The Cupa-Rocks Tumblers are a lesson in working smart not hard. Not only do they enhance the sensory pleasure of drinking brandy or whiskey by fitting perfectly in hand, the glasses create a swirling rotation when set down, which assists the aeration of your fine spirit and promotes an aromatic experience for the drinker, and means you don't have to sit there swirling like crazy and looking corny. Filling to the waist of the glass measures 6cl—considered the “perfect pour” for whiskey or brandy.