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D String Thomastik Superflexible 4/4 for Violin
Article 12 is the Superflexible D, and in this line it exists in one version only: a steel rope core with a chrome winding. Tension is 5.9 kp (13.0 lb), gauge medium, size 4/4, and the end is a copper crimp ball — the marker that identifies this string inside its envelope. The D ships in sets 15 and 15A with no alternatives, so this is precisely the voice the maker built into the balance of the series. The timbre comes out even and slightly reserved: this D does not try to take the solo, it holds the centre of the sound between a transparent A and a dense G.
🏆 SoundsGood — genuine Thomastik-Infeld strings only, made in Vienna.
The D Is Made in Chrome Only
The line offers a choice of winding for the E (chrome or aluminum) and even three options for the G, but the D is produced with a chrome winding exclusively — there is no silver or aluminum D in the Superflexible violin range. For a buyer that is actually a simplification: nothing to select, article 12 simply is the D of this series. If a listing offers you a "Superflexible silver D", the description is wrong — such a string was never made in this line.
5.9 kp Is a Gentle Step Between A and G
Across the set, tension falls from 6.5 kp on the A to 5.9 on the D and on to 5.5 kp on the G. The step between neighbours is small, and it is on the D that you feel it most: crossing from second to third string asks for no change in finger pressure or bow weight. Double stops on the A–D pair come out even in dynamics rather than stepped, and in cantilena the third string does not sag every time the bow arrives on it.
A Copper Ball and a Cable Under the Winding
The D ends in a copper crimp ball: in Superflexible the ball metal is tied to the note (brass on E and A, copper on D, nickel on G), so the string is unmistakable even without its envelope. Under the winding sits the same multi-strand steel cable that Thomastik describes as the means to "reduce stiffness and improve elasticity" — on the third string that reads as easy vibrato and quick response rather than effort. The steel core also ignores humidity, so the D holds its pitch between rehearsals.
Specifications
| Purpose | Single D string for violin |
| Line | Superflexible |
| Note | D (d¹ / re¹ / III string) |
| Size | 4/4 |
| Gauge | medium (mittel) |
| Tension | 5.9 kp (13.0 lb) — Thomastik publishes tension in kilograms (kg = kp) and pounds |
| Core | Steel rope core |
| Winding | Chrome — the only D winding in the line |
| End | Copper crimp ball end |
| Vibrating length | 32.5 cm (12.8") |
| Other gauges | light 5.0 kp (11.0 lb, code 12W), heavy 6.3 kp (13.9 lb) — per Thomastik's official table |
| Used in sets | 15 and 15A (both 25.7 kp total) |
| Thomastik article | 12 |
| Included | 1 string in an official Thomastik-Infeld 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 D string in an official Thomastik-Infeld envelope marked with article 12 and its gauge. It is the standard D of sets 15 and 15A, so no tension matching is needed.
Who It's For
For the player who replaces strings one at a time and has reached the third; for the violinist who wants a reserved, even D with no loud solo character; and for the Superflexible owner refreshing the middle of the range.
Frequently Asked Questions
What is the article number and what is this string wound with?
Article 12 — a Superflexible D on a steel rope core with a chrome winding, medium gauge, 4/4 size, 5.9 kp (13.0 lb), finished with a copper crimp ball end.
Is there a silver or aluminum Superflexible D?
No. In the Superflexible violin line the D is made with a chrome winding only — article 12. Thomastik never published a silver or aluminum D for this series, so any such label in a description is a mistake.
Is this D available in other gauges?
Thomastik's official table lists three: light 5.0 kp (11.0 lb, code 12W), medium 5.9 kp and heavy 6.3 kp (13.9 lb). The 2026 site publishes medium only for 4/4.
Why is the ball copper rather than brass?
In Superflexible the ball metal identifies the note: brass on E and A, copper on D, nickel on G. The ball is crimped on, so it is not meant to be removed, and no loop-end version of the string exists.
Which sets use this string?
Both full-size sets — 15 and 15A, each totalling 25.7 kp. In 1/2 size the equivalent chrome D is article 512 at 4.8 kp.
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
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💳 Installments — PrivatBank, Monobank
🎻 Order the Superflexible D string at SoundsGood! ⚡