Humbucker Special Alloy electric guitar strings are designed with a special composite core wire and a specially formulated wrap wire, to optimize their magnetic behavior for humbucker pickups. This produces a unique magnetic formulation to make the most of dual coil, high output pickups. They have a distinctive, rich tone that you notice right away. They also outlast conventional strings, so they won't have to be changed for a long time. And as with all Gibson guitar strings, Humbucker Special Alloy electric guitar strings are manufactured under strict quality controls and procedures, using only top-grade materials. As a result, they deliver great tone, quality, and durability.