Martin Authentic MA130FX Flexible Core Acoustic Strings
- 92/8 phosphor bronze wrap wire
- Flexible core: lighter-gauge core with heavier wrap wire
- Bronzed-steel core wire
- Line gauges: extra-light, custom light, light, medium
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A flexible-core phosphor bronze set for fingerstyle players and anyone who bends notes or tires out quickly. The listing does not say which gauge or pack size this one is.
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ASIN: B07Y2KKGZSCategory: Acoustic Guitar Strings
Overview
Not a standard Superior Performance set, the Flexible-Core MA130FX pairs a lighter-gauge version of that core wire with a heavier bronze wrap wire. The idea is a full, balanced tone with more give under the fingers.
Easier bends and less finger fatigue are the reasons to look at this set, with the core designed to flex more during note bending. The unknowns are gauge and pack count, which the listing leaves open across the product line.
Who it's for
Newer players and anyone practising for long stretches who want strings that bend more easily. Players after one specific gauge should check the manufacturer line before ordering.
Pros and cons
- Flexible core eases note bending
- Phosphor bronze wrap wire
- Bronzed-steel core wire
- Lighter core with heavier wrap
- Exact gauge of this set not listed
- Pack count unknown
- Acoustic guitars only
Performance notes
A lighter core wire lets each string flex more, which lowers the effort of bending and fretting. The heavier wrap wire adds mass, supporting a full and balanced tone. Gauge changes the feel and volume: lighter sets sound airy and suit smaller-bodied guitars, according to the listing.
Specifications
| Brand | Martin |
|---|---|
| String Gauge | Extra-light, custom light, light, medium |
| String Material Type | 92/8 phosphor bronze |
| Instrument | Acoustic guitar |
| Set Name | Authentic Flexible-Core |
| Core | Bronzed steel, flexible core |
Frequently asked questions
What is in the Martin MA130FX pack?
The listing gives no pack count and no included components, so confirm the quantity before ordering.
Are Martin MA130FX strings for electric guitar?
No. They are described as acoustic guitar strings made from 92/8 phosphor bronze.