Pathfinder Primal Spell Deck (2nd Ed) - Rules of Play says:

Unleash the fury of the natural world with Pathfinder Spell Cards! This must-have accessory for primal spellcasters contains more than 175 spell reference cards, covering every primal spell in the Pathfinder Core Rulebook, giving players immediate access to key game details without the need to slow down play to flip through a giant book. Players can easily arrange and plan their spells within moments, and a quick scan of the cards presents a caster’s tactical options at a glance. Primal magic offers plenty of perplexing possibilities, but Pathfinder Spell Cards make you a natural!