Kitvei Arizal set of 15 books writings by Rabbi Isaac Luria (the Arizal - Ha'ARI Hakadosh) Kabbalah
כל כתבי האר"י ז"ל
15 volume Hebrew publication features the writings and wisdom of the great Kabalistic Mekkubal Yitzchak Luria - the Ari HaKadosh , (1534-1572).
note: This set has the same material as the 18 volume edition, only printed in 15 volumes. (kabbalah)