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A String Pirastro Wondertone Solo 4/4 for Violin
The alternative A of the Wondertone Solo line — the one built on a steel core under an aluminium winding: Pirastro article 312221, mittel tension 5.5 kp, removable ball end. The standard A of this line is synthetic (art. 410221, 5.6 kp); this one exists for a brighter voice, and Pirastro labels it plainly as the steel-A version for players who follow the Russian solo tradition. It is the factory A of sets 410521 and 410525, where the D and G stay synthetic under silver. The character is clear, direct and a shade sharper than synthetic, with a very definite edge to the note.
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Steel Inside, Aluminium Outside: Clarity Without Extra Weight
Two materials here do opposite jobs. The steel core handles directness: it barely damps its own vibration, so the note starts sharply and keeps a clean outline instead of spreading. Aluminium is the lightest of the winding metals, which is precisely why it goes on an A — a heavy silver winding on the second string would add mass and thicken the middle, while aluminium leaves it transparent. The result is a middle register you hear as a voice of its own rather than as filler between the E and the D.
5.5 kp: The Lightest A In The Line
Wondertone Solo offers two A strings and this is the lighter one: 5.5 kp against 5.6 kp for the synthetic 410221. A tenth of a kilogram-force sounds trivial, but the A is where vibrato and intonation live in first and second position, and that is exactly where less resistance under the finger pays off physically. In sets 410521 and 410525 this A is the only metal string below the E, so it sets how firm the left-hand side of the fingerboard feels.
A Metal Core: A String That Is Ready Almost At Once
Synthetic stretches over the first few days, and during that window the second string drifts downward more often than the rest. A steel core has almost none of that problem: stretch is minimal, so the A settles into working pitch quickly — a real argument when a single string has to be replaced in the middle of a concert week. On top of that comes the property Pirastro claims for the whole line: outstanding tuning stability and insensitivity to variations in temperature and humidity.
Specifications
| Application | Single violin string |
| Series | Wondertone Solo |
| Note | A (second string) |
| Size | 4/4 |
| Tension | mittel (medium) — 5.5 kp |
| Core | Steel |
| Winding | Aluminium |
| End Type | Removable ball |
| Synthetic Alternative | Art. 410221: synthetic core under aluminium, ball end, 5.6 kp |
| Set Compatibility | The factory A of sets 410521 (ball-end E) and 410525 (loop-end E) |
| Pirastro Article | 312221 |
| Included | 1 string in a branded Pirastro envelope marked with the article number |
| Country of Manufacture | Germany (handmade) |
What's Included
The pack holds one A string with a removable ball, in a branded Pirastro envelope marked 312221. The ready-made sets built around this A are 410521 (with the ball-end E 310321) and 410525 (with the loop-end E 310621); the D and G are the same in both, 410321 and 410421.
Who It's For
A string for the violinist who wants a clearer, straighter middle than synthetic gives, for the player assembling a custom set who moves only the second string to steel, and for the musician who needs an A that is ready to work almost as soon as it is fitted.
Frequently Asked Questions
Is this A synthetic or steel?
Steel: article 312221 is a steel core under an aluminium winding at 5.5 kp. The line's synthetic A is a different article — 410221, at 5.6 kp.
Which Wondertone Solo sets use it as standard?
Two of them: 410521, where the E has a ball end, and 410525, where the E has a loop. In both, the D 410321 and G 410421 remain synthetic with silver windings.
How does it sound different from the synthetic A 410221?
Brighter and more direct: the steel core gives a cleaner edge to the note and a faster response, while synthetic under the same aluminium sounds softer. Pirastro describes this version as following the Russian solo tradition.
What end type does this A have?
Removable ball: take it off and the string fits a tuner built for a loop. There is no separate loop-end article for this A in the line.
Can I use it with strings from another line?
Yes. Keep to 4/4 and account for the 5.5 kp load: this is a light A, so alongside heavy D and G strings the middle may end up quieter than the bottom.
Are these genuine Pirastro strings?
Yes. SoundsGood supplies only genuine Pirastro product, handmade in Germany, in branded envelopes marked with article numbers.
🚚 Shipping and Payment
🏆 SoundsGood — full warranty and service support
✅ Quality guarantee — genuine strings only
🏪 Pickup — Kyiv, free
🚚 Nova Poshta / Ukrposhta / Meest — 1–3 days
💳 Installments — PrivatBank, Monobank
🎻 Order the Wondertone Solo A string at SoundsGood! ⚡