D'Addario Nickel Bronze NB13556BT Acoustic Guitar Strings
- 13.5-56 gauge, balanced tension medium
- Nickel-plated phosphor bronze wrap on a NY Steel core
- Set of 6 acoustic strings
- Uncoated, bright and balanced voice
- Replaced if defective
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A heavier balanced set for players who strum hard and want more resistance under the plectrum. The higher tension asks more of the fretting hand and the guitar's top than a light set.
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ASIN: B06XB5ZMMPCategory: Acoustic Guitar Strings
Overview
A bluegrass jam or a loud strumming session is where this medium D'Addario set fits, with more overall tension spread evenly across all six strings. Nickel-plated phosphor bronze wraps a NY Steel core and the strings are left uncoated.
Higher, evenly matched tension gives a firm feel for hard strumming and flatpicked lines. Medium tension is harder to fret, and some lightly built guitars are not set up for heavier strings.
Who it's for
Bluegrass and folk players who dig in with a plectrum get a set with extra tension and an even feel. Newer players and those with lightly braced guitars should stay with lighter gauges.
Pros and cons
- More tension for powerful strumming
- Even tension across all six strings
- Bright, balanced voice
- Uncoated natural feel
- Medium gauge is harder to fret
- Uncoated wire tarnishes sooner
- Guitar suitability for medium tension not covered
Performance notes
Higher string tension pushes the top harder, which gives more volume and resistance against a heavy attack. The balanced tension design matches the pull of each string so strumming feels even. Uncoated plated wraps keep the tone crisp until oxidation sets in.
Specifications
| Brand | D'Addario |
|---|---|
| Dimensions & fit | |
| Item weight | 0.01 kg |
| Construction & materials | |
| String Material Type | Nickel-plated phosphor bronze, NY Steel core |
| Coating Description | Uncoated |
| Included components | |
| Included Components | Set of 6 Nickel Bronze acoustic guitar strings |
| Warranty & support | |
| Warranty Description | Replaced if defective |
| Other details | |
| String Gauge | Medium, 13.5-56 balanced tension |
| Instrument | Acoustic guitar |
| Sound Profile | Bright and balanced |
Frequently asked questions
Is the D'Addario NB13556BT a light gauge set?
No. It is a medium balanced tension set at 13.5-56, with increased overall tension compared with lighter sets.
What playing style suits the NB13556BT?
D'Addario describes it as suited to powerful strumming and flatpicked playing, thanks to the even tension across all six strings.
Are these strings coated?
No, they are uncoated nickel-plated phosphor bronze.