Our watercolor postcards are expanded to 5"x 7" to give the artist a 30% larger artwork space over the traditional 4" x 7" postcard size. The cards are blank on one side and printed on the other for postage and whatever notes you would like to write. Letter size postage required. Each pack contains 15 cards. ACID FREE Weight: 140 lb. (300 g/m2) Surface: Cold pressed, textured Color: Natural white Media: Watercolor, gouache, pencil, pen, marker, crayon, charcoal, and pastel Options Available: Pack of 15 cards Proudly made in the USA.