Martin MA140 Authentic Acoustic Superior Performance 80/20 Bronze Guitar Strings - Light 12-54 demo The swivel area is 145°

The swivel area is 145° and is variable

When the footswitch is released the pitch will return to unity at the same rate

T model with fast

Excellent live sound featuring Sennheiser's renowned evolution microphone capsules

Martin MA140 Authentic Acoustic Superior Performance 80/20 Bronze Guitar Strings - Light 12-54 demo The swivel area is 145°Martin Authentic Acoustic Superior Performance SP strings feature higher tensile strength and tin plated core wire on all six strings that enable a fuller and more balanced tone, quicker response and increased tuning stability. Our impeccable standards for acoustic guitar tone are embedded in our string design and precision manufacturing process. That's why we make our own.