Basically, I hit with a Aeropro, with RPM 17 strung at around 55-56 lbs. I recently borrowed a friend's racket. I felt like the strings were amazing, good control and allowed me to hit through the ball, in maybe a way the RPM doesn't really allow... He doesn't remember the string, basically, is there a way to figure out what type/brand string it is?? Any other string related advice would be great as well :)