We've long wanted to send a card that reads, "I think of you, periodically," and this lovely, witty set makes it possible. Using the table of the elements, the cards here also spell out such messages as "Miss You," "Thank You," "Hi," and "Hugs + Kisses." Drawing its imagery from the book The Elements, the set includes 10 cards—roughly 4 x 6 inches—two of each design, plus envelopes.