I bought the 10pack of zymax strings from an ebay seller that some here recommended.
got 4 zymax 70 and 6 zymax67.
The ZM70 works great but I kept breaking ZM67 within 1 week EVERY TIME (one string only lasted 4hrs at 23lb).
My stringer took a closer look and found the ZM67 starts to develop micro tears even at 24lb. He said he had to pull the string VERY slowly to prevent tearing while stringing. The string doesn't break while stringing, but it definitely doesn't help with the durability during play. Anyone else have this problem?
No problems with ZM70 though (which I usually string at 24-26lb), always lasts exactly 6 weeks, always breaks in sweet-spot.