One Jade Lane - Whimsical - Happy Birthday POSTCARDS (Self-mailer) - 40 Cards - Heavy Stock - 4 Designs, 10 of each - Postage Saver. SAVE ON POSTAGE - Postcard will mail with USPS Stamps (currently only 34). POSTCARD Size: 4"x 6" - Printed on heavyweight (15 pt.) white, extra smooth stock. Set of 40 Whimsical series - 4 designs, 10 of each. Package contains 40 high quality thank you postcards. Printed and crafted in USA.