I am a 4.0 all court player who is not a string breaker. Chose Klip gut 18 @ 58 tension for my traditional VOLKL C10 PRO. Stiff enough to connect and pockets enough to direct. Next time I will set tension @ 60. After 10 hours 2 pds tension lost and holding steady. Loved it for my 12.02 oz Racket. Did not like it at lower tension 55 in my Blade 98 v7 felt like a marshmallow.