D'Addario Nickel Bronze strings featuring an innovative combination of nickel-plated phosphor bronze wrapped onto a high carbon NY steel core were developed to bring out the unique characteristics of any guitar, allowing its natural voice to truly shine and reveal the inner soul of your acoustic guitar. Nickel Bronze delivers unrivaled clarity, resonance, and projection, as well as outstanding balance and harmonically rich overtones. You will also enjoy better tuning stability and higher break resistance, thanks to the D'Addario engineered NY steel cores and plain steel strings. Like all D'Addario strings these are great sounding strings that will bring out the best qualities of your guitar. These premium 900 acoustic string sets provide a crisp, clear sound to accentuate the unique tone of your guitar. These are ideal for players who prefer a softer tone and easy bending or for beginners for the ease at which they can be played. These Balanced Tension strings are comprised of a mathematically optimized string gauge combination resulting in greater control and playing comfort in fingering, picking and bending. For example the NB1356 medium set has a differential in the tension from the string with the lowest tension to the string with the highest tension of 8.27 pounds, whereas these NB13556BT's have a differential of only 2.33 pounds.

I have used D'Addario strings myself for many years and like the way they "settle in" quickly. When I put these on and tune them up they stay there. These medium gauge Nickel Bronze sets are gauged .013- .056. If you haven't tried these yet, here's your opportunity.