These premium wine yeast strains have been cultivated specifically for wine making. Each wine yeast strain has its own unique flavor and fermenting characteristics. These are professional wine yeasts that are used by commercial wineries throughout Europe and other regions around the world. Each 8 gram packet of dried, granulated yeast is sufficient for fermenting up to 8 gallons of wine. They are simple to use; just tear open the package and sprinkle directly on top of the must.