The book you see here presented for sale, is one book of a great set of 15 books that as writin by Rabbi Isaac Luria (Ha'ARI Hakadosh).
The name of the book is called in Hebrew "Halikutim". In English it is called "The collections".
As I wrote , the all set of writings by Rabbi Isaac Luria including 15 books. What you see here is book number 15Â of 15. You can also buy all the 15 books at once.