Gauges 10-14-22-30-38-48. Pre-Alloy Phosphor Bronze Acoustic Guitar Strings are high-quality, long-lasting strings. Pre-Alloys are bright and unusually well-balanced in tone (first) and volume (second). They"re entirely all-American alloy phosphor bronze acoustic guitar strings with great clarity and durability. Gauges 10-14-22-30-38-48 Bright, well-balanced tone and volume