For the past 6 years, I played with a Wilson 6.1 (95 si) strung with Prince Synthetic Duraflex 16 at 65 lbs. With those specs, strings would last me a week (playing 5 days a week). Now, I'm playing with a Yonex RDS 001 (90 si) strung with the same Prince Synthetic Duraflex 16 at the same 65 lbs. After three string jobs, I've yet to make it past 20 minutes of hitting. My question. Can a change in racket really make that much of a difference in string durability?