"Four decks. One mission. Our future depends on it. With every deck sold, Art of Play will plant one tree.The Harmony Collection celebrates our planet's natural resources with four unique decks representing Sea, Land, Air, and Space. Together they embody our oneness as seen from the stars.The details spanning the collection will have you discovering new elements time and time again. From important figures in history to pop-culture references, all are clues to a bigger picture.Designed by Mauro Martins in Brazil and printed by The United States Playing Card Company."- The cards are poker size.