In my experience, strings that break at the bridge, nut, or tuner post are telling you there is a problem with those components. The exception is strings that have been repeatedly moved from instrument to instrument, or repeatedly removed and reinstalled. In example, think of bending a piece of metal back and forth until it breaks. I have never had or seen a string failure of any brand when the strings were installed properly, tuned up to tension, and then just played, however hard. I have seen, however extremely rarely, a defective new string right out of the package. When you open a new package of strings, inspect each string carefully before you install any of them. If you see any defect after inspecting a new string before you install it, however slight, don't install it, get it replaced. I have never been refused a replacement by any dealer or manufacturer.
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