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

Magic explodes from your fingertips when you hold Pathfinder Spell Cards in hand! This must-have accessory for arcane spellcasters contains more than 200 spell reference cards, covering every arcane 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. Take your first step toward arcane mastery with Pathfinder Spell Cards, and never go into a fight unprepared again!