Better than the Brown Bag Method! Why? Because you can see what's happening.Vintage Fruit Ripening Bowl by Jareen, is a deep plastic bowl with a dome-like lid, of clear polycarbonate. Holes, especially located by agro scientists in the bottom and top pieces, allow heavier carbon dioxide to escape below while fresh air enters in from the top. Meanwhile, ethylene gas, which the fruit gives off naturally during ripening, is contained within the dome to accelerate the process. (Chicago Times article C. 1989)The Jareen "Pick of the Season" Fruit Ripener is rare and from 1984-ish. The concept was developed at The University of California, in cooperation with California Tree Fruit Agreement. Provides a year-round ideal climate in which natural ripening of market-hard food takes place.Two piece family size capacity bowl measures approx 10 1/4 inches across.