This set include all 5 different prerelease packs, each one representing a different family in Streets of New Capenna.
 
Each Streets of New Capenna prerelease kit contains:
5 Streets of New Capenna Draft Booster Packs
1 Streets of New Capenna seeded "Family Booster" with family-focused cards
A random FOIL Rare or Mythic Prerelease promo card, drawn from any rare or mythic in the set
A Spindown Life Counter