Pyramid 652 oud strings.
This set (652 000, yellow label) is an alternative to the popular 650 set, featuring black nylon and bronze basses for a different tone. This is the version with a wound 3rd course.
This is a 10-string set, it does not include the single 6th bass course. For an 11-string set, add the 6th course (652-206) separately.