The double task of aerating and measuring the wine is done easily with this acrylic aerator/dispenser. It mounts onto a wine bottle. The bottle is tilted to fill, or partially fill, the bowl. A natural fill stops automatically at the 4 oz. mark. But there are graduated fill lines ranging from ½ oz to 4 oz. Bottom screws off for easy cleaning. 5-1/4” wide (on the bottle), 3-3/4” high.