D'Addario XS Phosphor Bronze Acoustic Guitar Strings — Custom Light 11-52 — 25-Set Bulk Pack

The D'Addario XSAPB1152-B25 is a bulk pack of 25 sets of XS Phosphor Bronze acoustic guitar strings in Custom Light gauge (11-52). Custom Light sits between Extra Light (10-47) and standard Light (12-53) in D'Addario's gauge lineup — a step lighter than the most commonly used acoustic gauge, giving players more playability and lower tension while retaining more volume and projection than Extra Light. The XS coating is D'Addario's highest-level string protection system: an ultra-thin film on the wound strings and a polymer treatment on the plain steels, designed to deliver the longest acoustic string life in D'Addario's range without compromising tone or feel.

Custom Light 11-52 — What the Gauge Means and Who It Suits

String gauge in acoustic guitar strings refers to the diameter of the individual strings, measured in thousandths of an inch. The first and sixth strings define the set name: an 11-52 set has a .011" first string (high E) and a .052" sixth string (low E). The tension each string exerts on the guitar's top, bridge and neck increases with gauge.

Custom Light 11-52 strings produce notably lower tension across the set than standard Light 12-53. The high E (.011) is measurably easier to bend than a .012, which matters most in the lower positions where acoustic guitars typically have higher action than electrics. The low E (.052) is actually only marginally lighter than the 12-53 low E (.053), meaning the bass strings retain most of their weight and projection — it is primarily the treble and mid strings where the reduced tension is felt.

Custom Light gauge is well suited to players who play acoustic guitar regularly but find the tension of standard light gauge fatiguing over long sessions, players recovering from hand or wrist injury, players coming from electric guitar who find acoustic strings stiff, and fingerstyle players who want maximum responsiveness from the treble strings without losing bass weight. On shorter-scale acoustic guitars (such as parlour guitars or short-scale dreadnoughts), standard Light gauge strings produce higher tension than on a 650mm or 645mm scale, making Custom Light a particularly practical choice.

XS Coating Technology — Longest-Life D'Addario Acoustic String

The XS coating system separates wound strings and plain steels because they degrade differently and require different protection approaches. Wound strings corrode as contaminants — sweat, skin oils, humidity — penetrate the micro-gaps between the winding wire and oxidise the metal beneath. The XS film is applied into those gaps at the winding stage, sealing the winding against contamination before it can occur. The coating is thin enough to sit within the winding profile rather than above it, preserving the string's surface texture and diameter.

Plain steel strings oxidise from their surface rather than from gaps between windings. A film coating on a plain steel alters its diameter and vibration geometry, which affects pitch and tone. D'Addario's XS polymer treatment addresses plain steel oxidation without adding measurable material to the string's surface.

D'Addario's internal testing places XS as their longest-lasting acoustic string and measures tuning stability at 131% better than standard (uncoated) acoustic strings — a function of the NY Steel core and Fusion Twist ball-end construction as much as the coating itself. String-to-string consistency across 25 sets from a production batch is tighter than individual retail sets due to the controlled environment of bulk production and packaging.

NY Steel Core and Fusion Twist Ball End

D'Addario draws its NY Steel string core at its Farmingdale, New York facility to proprietary high-carbon specifications. The controlled draw process produces a core wire with consistent diameter tolerances and surface finish that translates to more accurate pitch across the string's length and better intonation up the neck. The higher tensile strength of NY Steel compared to commodity string steel also reduces the likelihood of break failure at the saddle, nut or ball end — the three highest-stress points on an acoustic string.

Fusion Twist is D'Addario's ball-end attachment process. The twist that secures the string to the brass ball end ferrule is fused rather than left as a free mechanical joint, producing an attachment point that does not work loose under repeated string cycling and bridge-pin loading. A string that shifts slightly at the ball end produces tuning instability that is independent of the tuning machine or nut. Fusion Twist removes this variable.

Phosphor Bronze — Tone Character

Phosphor Bronze winding wire is a copper-tin alloy with added phosphorus. The phosphorus serves as a deoxidiser that slows the alloy's own oxidation process, meaning Phosphor Bronze wound strings begin the corrosion process later than 80/20 Bronze (copper-zinc) even without coating. Combined with the XS film, the result is wound strings with multiple layers of corrosion protection working in parallel.

Tonally, Phosphor Bronze produces a warm, balanced response with a full low-mid range and smooth high-end. It suits a wider variety of playing styles than 80/20 Bronze, which has a brighter, more immediately punchy character that can become harsh on bright-voiced guitars or with a pick attack. Phosphor Bronze is the standard choice for most acoustic guitar applications from fingerstyle to strumming to recording, and is the preferred winding for cedar-topped or mahogany-bodied guitars where 80/20 might push the treble response beyond the guitar's natural balance.

VCI Packaging and Players Circle

Each set in the XSAPB1152-B25 bulk pack comes in D'Addario's recyclable, resealable VCI (Vapour Corrosion Inhibitor) bag. VCI packaging actively suppresses corrosion within the sealed environment by releasing a vapour-phase inhibitor that protects metal surfaces inside the bag. This means strings stored in their original bags have their life extended before installation, not just after — a practical benefit when holding a 25-set stock. Each bag carries a unique registration code for D'Addario's Players Circle loyalty programme, redeemable per set.

Who Is the XSAPB1152-B25 For?

The XSAPB1152-B25 is best suited to players who want the longevity and smooth feel of the XS coating in a gauge lighter than standard Light — whether that's because they find 12-53 stiff, are playing a short-scale acoustic, are recovering from hand fatigue or injury, or simply prefer the response of 11s. The 25-set volume format suits gigging players who change strings regularly, music teachers who restring student instruments, and teaching studios or rehearsal rooms that maintain a fleet of acoustic guitars. Players who have been buying single sets of XS, Elixir Nanoweb or similar coated strings and have decided on 11-52 as their gauge will find the bulk pack the most economical way to keep stock.

Specifications and String Tensions

Individual String Gauges and Tensions

Frequently Asked Questions

What is the difference between Custom Light 11-52 and Light 12-53?

One gauge step — but the difference is meaningful in feel. The .011 first string is noticeably easier to bend than a .012, and the plain steel strings (1st, 2nd, plain 3rd if applicable) are where tension is most directly felt underhand. The wound strings from D to low E are also lighter, though the difference is smaller by proportion. Players who find 12-53 slightly stiff, who play a lot of open-chord strumming or single-note lead on acoustic, or who have wrist or tendon concerns will typically find 11-52 meaningfully more comfortable. The trade-off is a modest reduction in volume and projection compared to 12-53 — the difference is audible when comparing sets on the same guitar but not dramatic. In band or stage contexts where a pickup or microphone is in use, the difference is negligible.

Will lighter gauge strings affect my acoustic guitar's setup?

Changing from 12-53 to 11-52 reduces the total tension on the guitar's top, neck and bridge. On most acoustic guitars this means the neck will have slightly less forward bow — the truss rod may need a small adjustment to re-establish the correct relief. Action at the saddle may also decrease slightly, as less string tension means less resistance against the neck's natural forward tendency. For most guitars this adjustment is small and worth making, as optimal setup for 11-52 will produce better playability and intonation than leaving the guitar set up for 12s. If you're not confident making the adjustment yourself, bring the guitar in and we'll set it up correctly for the new gauge.

Why does the G string tension (25.4 lbs) sit higher than the A string (28.9 lbs)?

String tension is a function of diameter, scale length and pitch — not diameter alone. The G string (.022) is a wound string tuned to G3, while the A string (.042) is tuned to A2. Because the A2 string is tuned to a lower pitch, it requires a larger diameter to reach similar tension; at .042 it produces 28.9 lbs. The G string at .022 produces 25.4 lbs at G3. The pattern of tension across the set is not uniform because each string has a different pitch target, and string sets are designed so that tension is reasonably balanced rather than perfectly equal — no set of six strings tuned to standard pitch will have identical tension across all six positions. The 11-52 Custom Light set is well balanced relative to other D'Addario sets in this gauge range.

How do I use the Players Circle codes from the bulk pack?

Each individual set within the 25-pack comes in its own resealable VCI bag printed with a unique registration code. You register each code at D'Addario's Players Circle website to accumulate points, which can be redeemed for D'Addario products, merchandise and accessories. Because the XSAPB1152-B25 contains 25 individually bagged sets, you have 25 codes to register — the same number as buying 25 single-set packs, at the bulk price.

Are XS strings suitable for parlour and travel guitars?

Yes — XS strings are a strong match for parlour and short-scale acoustic guitars. Shorter scale length increases string tension at a given gauge and pitch compared to a full-scale instrument: a 12-53 set on a 628mm parlour guitar feels noticeably tighter than the same set on a 650mm dreadnought. Moving to 11-52 Custom Light on a shorter-scale guitar often brings the playability closer to what a player expects from their standard-scale instrument, without reducing the string weight so far that the guitar loses its low-end balance. The XS coating's longevity benefit applies equally to smaller guitars.