Martin 3 Pack MA550PK3 SP Phosphor Bronze Authentic Acoustic Guitar Strings Medium 13-56

Martin® Authentic Acoustic® Superior Performance SP® strings are crafted for players who demand the best in tone, response, and tuning stability. Featuring higher tensile strength and tin-plated core wire on all six strings, they deliver a fuller, more balanced sound with quick response and improved tuning stability—even in the most demanding playing environments. Built to Martin’s exacting standards, these strings provide reliable, consistent performance whether you’re on stage, in the studio, or at home. For musicians who expect their strings to work as hard as they do, SP® strings are the perfect choice.

Features

• Higher tensile strength for a fuller, more balanced tone
• Tin-plated core wire on all six strings for enhanced tuning stability
• Quick response for expressive, dynamic playing
• 92/8 Phosphor Bronze wrap for warm, rich, and balanced acoustic sound
• Precision manufacturing for consistent quality and reliable performance

Specifications

General
- Model: MA150
- Series: Authentic Acoustic® Superior Performance SP®
- Wrap Material: 92/8 Phosphor Bronze
- Core: Tin-plated on all six strings
- Corrosion Resistance: Enhanced tuning stability

Gauge (Medium)
- E (1st): .013
- B (2nd): .017
- G (3rd): .026
- D (4th): .035
- A (5th): .045
- E (6th): .056

Other
- Tension (Full Set): 189.6
- Sound Profile: Warm, balanced tone with strong projection
- Longevity: Built for consistent, reliable performance
- Suitable for: Acoustic guitar players seeking professional-quality tone, stability, and responsiveness