Our postcards are printed on 16 pt (360 gsm) premium quality cardstock. The postcards are UV-coated on the front side for durability and protection. Size 4 x 6 inches (10 x 15 cm). Printed in USA. All postcards in this set are reprints from original vintage postcards (ca. 1930-1940's), except Hawaii, which is an artistic reproduction based on the large letter name postcard style.