Sonotone Fusion - Cusom Alloy HARMONIC • FLEXIBLE • ARTICULATE Fusion and is compatible with a variety of genres. Sonotone tested custom alloy strings. The soft tension makes it easy to carry but does not lose picking. You can feel the bright yet rich low end. Although basic skills are required to mute sounds and properly handle sounds, the moment you play the best it has advanced playability and expression, just like a prestigious sports car driver.