Signum Pro Plasma HEXtreme 660' Reel 17g-1.25mm

As a high school tennis coach who feeds balls most of the time and plays students once in a while, I find this string more durable than others that I have used. However, as a former serve-and-volleyer during my younger days, I do find a lack of feel. But that's always the trade off: durability for feel. Still, it does the job for me in my current role.