Light tension. All RED series strings. Plain strings are made with a bioplastic Aquila calls Sugar, all wound strings are red copper. Tuned cc gg dd AA FF C, first course 2x Sugar, second course 2x Sugar, third course 2x bio-plastic, fourth course 2x RED wound, fifth course 2x RED wound, eleventh string RED wound. The third course is normally wound. Aquila is introducing 3rd course unwound strings using a special bio-plastic loaded with metal powder in order to increase the density.