From the publisher's website:
Tired of the same old double damage? Wouldn’t you rather chop off your opponent’s head in one clean swing or put an arrow in his heart? Paizo Publishing presents the GameMastery Critical Hit Deck!
Rolled a critical hit? Draw a card and apply the result. Each of the Critical Hit cards in this 52-card deck has four different results based on weapon type, all of which are compatible with the 3.5 rules set and the Pathfinder Roleplaying Game.
Crushing your enemy’s skull has never been this much fun.
Useable by experienced GMs and novices alike, this product fits perfectly into any Game Master's arsenal.