Heavy Core guitar strings are uniquely designed with Dunlop's proprietary core-to-wrap ratios that are meticulously calculated so the guitar player can really "dig in" while retaining sound fundamentals. Heavy Core strings (like all of Dunlop's replacement guitar strings) are manufactured with the highest-quality materials and are engineered for great tone, balance, and feel.

"Heaviest" guitar string gauges: 12-16-20-32-42-54