Krupp Brothers produces Cabernet Sauvignon from Napa Valley, drawing fruit from Stagecoach Vineyard and other sources in the region. The winery's portfolio centers on this single varietal, with three flagships: M5 Cabernet Sauvignon, 101 Cuvée Cabernet Sauvignon, and Veraison Cabernet Sauvignon. All three have been assessed by major critics including Wine Enthusiast, Wine Advocate, Decanter, and Wine Spectator. Napa Valley's volcanic soils and diurnal temperature swings favor Cabernet Sauvignon, yielding wines with structure and depth. The M5 expression from Stagecoach Vineyard carries particular prestige among the house's releases.