If you are experiencing problems with breaking strings then this article may help isolate some issues.
”Strings do break from age or because of a flaw in the string but most string breakages are caused by a problem with the instrument…”
Rotosound NXE10 Nexus Coated 10-46
Black Polymer coated wound, Gold Series plain strings.
Mention a Type 52 pure nickel alloy string to discerning guitarists and they will tell you about the extra lift that the higher magnetism offers. Now shroud it with a special black polycoat material and you have a high energy string smooth to the touch, rich in warm tones with extended life.