I used a damper after several hours. I usually do not use one. A nice string for anyone needing durability who doesn't mind the stiffness. My junior string breakers would like this. It is not hard on the arm like Kevlar.
String plays very dead with a spongy feel.
The string played firm yet did not adversely affect my arm. After 25 hours of playing, the tension loss appears to be minimal. Stringing was difficult at best. I thought I was weaving a 16 gauge wire through the frame. Had difficulty keeping the string uncoiled.