The Mad Millie Cheese Culture is the perfect culture for soft and hard cheeses. Each sachet contains a blend of freeze dried Lactococcus lactis subsp. cremoris and Lactococcus lactis subsp. lactis. Each sachet contains enough culture for 4 L of milk. Activity = 2.4 U. 5 sachets will make: 5 batches (2.5 kg/5.4 lb) of Hard Cheese or 20 batches (8 kg/17.5 lb) of Soft Cheese Contains: Milk