This set contains 20 identical postcards.Size 4 x 6 inches (10 x 15 cm). Glossy UV coating on front for durability and protection. Our postcards are printed on 16 pt (360 gsm) premium sturdy quality cardstock. This is the maximum thickness allowed by USPS for a postcard to be mailed without an envelope.Large letter US state name post card pack (ca. 1930's-1940's). Made in USA.