Private Collection Series from Wyeast Laboratories.  Each quarter Wyeast produces 3 seasonal strains of yeast.

Private Collection yeast strains are packaged in "The Direct Pitch ACTIVATOR™" containing 100% Pure Liquid Yeast -100 Billion cells- plus an internal nutrient packet. This Wyeast Smack-pack™ system allows yeast metabolism to begin prior to inoculation as well as providing proof of yeast health. The ACTIVATOR™ is designed to inoculate 5 gallons of wort with the same pitch rate recommended by professional brewers.