Tonnelleries François Frères is a French manufacturer of oak barrels for conserving and transporting liquids. The company has four core businesses: stave milling, cooperage, cask manufacturing and oak wine-ageing products. It also offers oak products for oenology (the science and study of wine and winemaking), where the wine is put in contact with wood in varied forms. Furthermore, it has developed products for the alcohol maturing and ageing market, in particular the whisky market. It operates through several global subsidiaries, including Sogibois, Bouyoud, Treuil, Francois Inc, Classic Oak New Zealand and Demptos Napa. It has operations in France, the United States, Spain, Hungary, South Africa, China, New Zealand, Australia and Ireland.