I'm not sure if you read this on their website or not.
Product Description
ST-B01 is a multipurpose thermophile blend of Streptococcus Thermophilus strains.
The culture is used primarily in soft mild cheeses with little or no post acidification; Robiola, Stracchino/Crescenza, Swiss types, or stabilized bloomy styles such as Camembert or Brie. This culture can be used on its own, as an adjunct, or blended with other cultures to make Emmental, Tomme, Cheddar and other continental cheeses. Very long shelf life and excellent phage resistance.
Sold in individual 50 U sachets or discounted creamery size cases of 30x 50 U sachets. Made in Denmark or France.
http://artisangeek.com/chr-hansen-st-b01-thermophilic-starter-blend/