Periodic Elements Laboratory Flask Oil and Vinegar Dispensers - Set of 2 This unique set of oil and vinegar dispensers is in the shape and style of science lab flasks with a rubber stopper closing the tops. Humorous play on periodic element table, bottles are labelled with "Oi" for Oil and "Vi" for Vinegar. Reverse side of each flask has 250mL markings. Like traditional lab flasks, these include rubber stoppers that protrude a small metal tube for easy pouring. Each flask measures approximately 5.5 inches tall and 3.25 inches wide at the base. Great gift for the scientist or student. Totally unique. Each holds 10 fluid ounces.