There are a great many crafts that stand completely alone and need nothing from other crafts to make them complete. One exception to this rule is the micro brewing industry. Those who brew small batches of beer with their own recipes have found that the craft of barrel making affects them greatly. Coopers are the people who make these barrels. Until recent times, their craft had mainly been replaced by commercial breweries using metal barrels. Different woods produce slightly different flavors and this was not preferred by commercial companies. Small breweries, ever seeking uniqueness, have found that experienced coopers are necessary to their craft.