Ashaway UltraNick 17g Squash String
The use of Zyex in a multifilament allows this string to strike a great balance between soft feel, power and resilience.
With the added benefit of increased tension stability and a textured outer wrap for better spin potential. The 17 gauge will give you more durability.
Ashaway recommends stringing Zyex string at 10-15% less than you would have it for a traditional nylon.