These prints are modern reproductions of Ernst Haeckel's natural history series entitled Artforms In Nature, originally printed in 1898 to 1904. They are approximately 9 3/16" by 12 3/8" and the image area is approximately 7 1/2" by 10 1/2" and are printed on heavier weight paper. They are 2-sided print although the back side doesn't show through the thick stock. These are modern reproduction prints, not antique.