Studio Oh! 24 Count Snail Mail Postcard Book, Birthday Studio Oh Snail Mail Birthday Postcards are colorful, quick and convenient to send; postcards measure 6.5 x 4 Inch Each postcard book comes with 24 different, cleverly-designed postcards giving you oodles of options for saying "happy birthday" The postcards have space to write a brief personal note, are printed on heavy card stock using soy-based inks and are also recyclable It's easy to brighten someone's day with 4 fabulous Snail Mail postcard books from which to choose: Witticisms, Thank You, Birthday and Love & Friendship The Studio Oh inspired collections of finely crafted and cleverly designed journals, planners, home and kitchen accessories are available on Amazon