These strings resurrected a flamenco guitar that I was going to sell. Mounted on an Alhambra 7fc and there was such a distinct improvement in the volume and quality of sound that I decided to hold the guitar. The tension is perfect, because it is hard enough to offer the right resistance without tiring hands (both right and left). The bass is powerful enough to reinvigorate the faint bass of a cypress guitar, the highs are bright and soft enough to permit easy tremolos. Now I want to try the 815MT!