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.013 .013

A folk guitar string with a tension of 0.13 is a string with a thickness of 0.013 inches or 0.33 millimeters. Guitar strings are often classified by thickness, measured in millimeters or inches, as well as tension, measured in pounds or kilograms. The gauge of the string determines the sound produced, as well as the tension needed to reach that note. Thicker strings generally have a richer, warmer sound, but also require more tension to play.