This DIY Thermophilic Cheese Starter Set is used to make Parmesan, Romano, Provolone, Swiss, and more. Each package contains 4 Packets of Starter Culture and 2 Rennet tablets. Direct-Set cultures are a one-time-use culture, they cannot be recultured (i.e. perpetuated beyond the single batch). Direct-Set cultures are often preferred by cheese makers as they require no maintenance or care. Simply keep the packet in the freezer and remove the portion for your recipe when it's time to make cheese. Most Direct-Set cultures contain multiple doses to inoculate multiple batches.