Each of the Player's Handbook 2 Power Cards packs contains 100 power cards for a single character class from Player's Handbook 2 (D&D 4e), and a few blank power cards.
From the back of one of the boxes
With Player's Handbook 2 Power Cards, you don't need to crack open a rulebook every time you cast a spell or swing your sword. All the crucial information is at your fingertips. Just pick out the deck for your character class, select the cards for your character's powers, and you're ready to play the Dungeons & Dragons Roleplaying Game!