This set (650 000, orange label) is Pyramid's standard 5-course Arabic tuning set, with wound 3rd course. A good all-around set for Arabic ouds.
This is a 10-string set, it does not include the single 6th bass course. For the 11-string set, choose our Pyramid 650/11 set, or add the 6th course (650-206) separately if the 650/11 set is not available.