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A String Thomastik Dominant 4/4 for Violin
The A wears out first — it carries most of the left hand in first position and is the string most often replaced on its own. In Dominant that is article 131: a synthetic multifilament core (perlon) with an aluminum winding, 4/4 size, mittel gauge, tension 5.5 kp (12.13 lb), brass ball end. The aluminum is no accident: it is the lightest metal used in the set, adds almost no mass, and so keeps the middle register transparent and quick rather than sluggish. The Dominant line offers no other winding for the A — Thomastik treats this combination as the finished answer, betting on strings that emphasize an instrument's individual character.
🏆 SoundsGood — genuine Thomastik-Infeld strings only, made in Vienna.
The A Gives Up First — and You Feel It Before You Hear It
Aluminum is soft, and the A takes the bulk of the left hand's working hours, so the winding gradually flattens where the fingers keep landing. What changes first is not the sound but the feel: flat patches appear under the fingertip, then the string starts holding pitch less well in first position, and only after that does the timbre go dull. That is why buying the A on its own makes sense instead of waiting for the whole set to die — the other three are usually still fine.
5.5 kp — Exactly the Factory Set Figure
This A carries precisely the tension of the A in sets 135, 135A, 135B and 135BA. Replacing one string therefore does not tilt the instrument: bridge and soundpost stay under the same load, and the other voices do not drift once you have tuned. Buying the 131 singly is not a compromise but the normal way to stretch a set.
Perlon Under Aluminum: How the Middle Feels
A multifilament synthetic core is thicker and softer than steel, so the 131 takes wide vibrato well and does not cut into the fingertip on long notes. Combined with the light aluminum winding it gives a quick response in the register where most of your phrasing lives: double stops against an open D do not turn to mud, and a melody in first position carries without extra bow pressure. If you want more resistance there is 131st (5.9 kp), and if you want less, 131W (4.6 kp).
Specifications
| Purpose | Single violin string |
| Line | Dominant |
| Note | A |
| Size | 4/4 (full) |
| Gauge | medium (mittel) |
| Core | Synthetic multifilament core (perlon) |
| Winding | Aluminum |
| End | Brass ball end |
| Tension | 5.5 kp (12.13 lb) — Thomastik publishes tension in kilograms (kg = kp) and pounds |
| Same A in other gauges | 131W — light, 4.6 kp; 131st — stark, 5.9 kp |
| Other voices in the line | 132 (D aluminum, 4.1 kp), 132A (D silver, 4.5 kp), 133 (G silver, 4.4 kp) |
| Sets containing this string | 135, 135A, 135B and 135BA — the A is the same in all of them |
| Thomastik article | 131 |
| Included | 1 string in a branded Thomastik envelope marked with the article number |
| Country of Manufacture | Austria, Vienna (Thomastik-Infeld has been developing and producing strings in Vienna since 1919) |
What's Included
One A string in a branded Thomastik envelope printed with its article number. This is a single string, not a set — E, D and G are ordered separately or as a full set.
Who It's For
For the player who practises daily and kills the A before the rest of the set; for the violinist who needs a transparent, uncluttered middle in chamber work; and for anyone assembling their own combination of voices who wants aluminum-wound synthetics on the A rather than steel.
Frequently Asked Questions
What is the tension of this A?
5.5 kp (12.13 lb), mittel gauge. It matches the A in the factory Dominant sets, so the string drops in without upsetting the balance.
Is there a Dominant A with a different winding?
In the Dominant line the A is made with an aluminum winding only. A steel-core A with a chrome winding exists in the Dominant Pro series — article DP02B, 6.1 kp.
Which other gauges are available?
Three: light 131W at 4.6 kp, medium 131 at 5.5 kp and stark 131st at 5.9 kp. The construction is identical; only the tension changes.
Ball end or loop end?
A brass ball end. The ball metal helps tell Dominant strings apart: brass on the A, copper on the D, nickel on the G.
Which D and G go with this A?
From the same line: D — 132 with an aluminum winding (4.1 kp) or 132A with silver (4.5 kp); G — 133 in silver (4.4 kp). Together with the E 130 that reproduces the factory balance of set 135 or 135A.
Are these genuine Thomastik strings?
Yes. SoundsGood supplies only genuine Thomastik-Infeld product in official packaging 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 Dominant A string at SoundsGood! ⚡