Ernie Ball Earthwood guitar strings are manufactured with the sort of precision that makes you wonder whether tiny guitar-string engineers are standing around with clipboards judging every molecule of bronze. The strings are made by wrapping carefully selected bronze alloy wire around a hex-shaped steel core, with the materials and winding process designed to produce consistent tone, feel, and durability. Ernie Ball then puts the strings through quality-control checks to make sure they meet its standards before they get packaged up and sent off to musicians everywhere. The result is a string that looks deceptively simple but is actually the product of some fairly serious manufacturing know-how, because apparently making a piece of wire sound good when someone repeatedly hits it with their fingers or a plastic pick is a more complicated business than it appears.