The JS113 is a string set from the Jazz Swing series and is specifically designed for semi-acoustic and acoustic jazz guitars. In other words, the big hollowbody models, electric or otherwise. These flatwound guitar strings are characterised by a warm, loud sound. With string thicknesses ranging from .013 to .053 inches, the Thomastik JS113 is the thickest set in the series and, in addition to being 'mellow', it is also extra full of tone. The extra thickness also means more string tension, so more sustain and a tighter sound.