Oud String PVF Trebles by MusiCaravan Powerfully projects treble range of your instrument. Brings the treble of the instrument into balance with bass and midrange. Long lasting---stays in tune forever! 1 set of PVF Trebles typically lasts through 3 changes of bass strings! Very stable---after initial "stretch," stays in tune way better than nylon trebles. Set contains string for 1st and 2nd courses only (2 pairs of strings, tuned A and D in Turkish. Can also be used on most Arabic ouds.)