Pure nickel round wound, wound 3rd string! These are the original set for the legendary Gibson L5 jazz archtop guitar. By combining the warmth of pure nickel wrap wire with the bright overtones of round wound design, the L5 strings capture the essential, hand-crafted tone of the Gibson archtop guitars. L5 Jazz Electric Guitar Strings are great for players who want a heavier, jazzier feel to their guitar strings, but also want that crisp attack of a round wound string. The combination of the pure nickel wrap, optimum string gauges, and a wound third string provides great balance and feel, and even string-to-string volume. L5s deliver rich, strong jazz chord voices and single note melodies, and work great on hollow or semi-hollow body guitars. And as with all Gibson guitar strings, they are manufactured under strict quality controls and procedures, using only top-grade materials. As a result, they deliver great tone, quality, and durability.