What is difference between Ashaway monogut zx and zx pro?


Talk Tennis Guru
Just FYI here is what Ashway says:
http://www.ashawayusa.com/Polyketone9.php said:
Ashaway Racket Strings offers two versions of its popular Zyex-based tennis strings, 16 gauge (1.27 mm) MonoGut ZX, and 17 gauge (1.22 mm) MonoGut ZX Pro. MonoGut ZX Pro is a thinner lighter string, designed to provide even better elongation, snap-back and playability for players who do not require the added durability of a 16 gauge string. Both strings offer 100% Zyex monofilament construction, which provides exceptional dynamic stiffness and gut-like playability.