String Lab FluOzone tennis string in 1.30mm (16 gauge), yellow color, 12m (40') set.
FluOzone is a great choice in open-pattern frames, as its high stiffness, combined with the slick PEEK coating, allows for great "snap-back", greatly increasing spin. 
Baseline players will greatly enjoy the ability to swing out with full power and spin over many hours of play with FluOzone,along with the great value pricing.