This set contains 10 postcards, each of unique design, portraying vibrant art by Ernst Haeckel. Size 4 x 6 inches (10 x 15 cm). The glossy UV coating on the front for durability and protection. Postcards are printed on 16 pt (360 gsm) premium sturdy quality cardstock. Ideal for collectors, postcrossing, scrapbooking, school postcard exchange projects, gifts, invitations, or just sending a note to a friend.