Martin MA550T Authentic Acoustic Lifespan® 2.0 Guitar Strings Phosphor Bronze, Medium Stageline Parametric

Parametric

you also get a full suite of music creation apps

They can be powered by a 9V/PP3 battery as well as an optional mains adaptor

here they are

and publication

Martin MA550T Authentic Acoustic Lifespan® 2.0 Guitar Strings Phosphor Bronze, Medium Stageline ParametricMartins next generation Lifespan 2. 0 strings are engineered using a new, patented technology only available from Martin. This technology was developed to protect the core wire and the wrap wire to prevent corrosion without compromising tone the single most important attribute of the guitar strings. Authentic Acoustic Lifespan 2. 0 strings look better, sound better, and feel better, providing a smooth playing experience that reduces finger drag. They