Kobalt is an artisanal producer in Napa. It was started in 2001 by Kevin Carriker, who worked in vineyards and cellars in Napa and Bordeaux before acquiring a small vineyard in southeastern Napa Valley. With help from consulting winemaker and entrepreneur Mark Herold, Carriker now makes about 20 barrels of Cabernet Sauvignon annually. Kobalt also makes Port and Sauvignon Blanc.