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Set of strings Thomastik Superflexible (medium) 4/4 for violin E-aluminum
Superflexible is the steel orchestral classic of the Viennese house Thomastik-Infeld, and it rests on one construction choice: all four strings are wound not over solid wire but over a steel rope core — a multi-strand twisted cable. The maker puts the result plainly: that rope core "reduces stiffness and improves elasticity", the strings offer "excellent purity of open fifths", and their "impressive durability and tuning stability make them very dependable all-around strings". Set 15 is the 4/4 configuration in medium gauge with an aluminum-wound E (art. 9, 7.8 kp) and chrome-wound A, D and G (art. 10, 12 and 13). Together that is 25.7 kp (56.6 lb) at a vibrating length of 32.5 cm. The voice comes out even and solid across the range — a set for an instrument that works daily rather than sitting in its case.
🏆 SoundsGood — genuine Thomastik-Infeld strings only, made in Vienna.
How 25.7 kp Is Spread Across Four Voices
Tension steps down evenly: 7.8 kp on the E, 6.5 on the A, 5.9 on the D and 5.5 kp on the G. The E is deliberately the tightest — the top voice has to take bow pressure in high positions, otherwise it hisses instead of speaking. Because the step between neighbours is small, the left hand does not have to recalibrate moving from A to D or from D to G: the same finger pressure gives the same pitch. The right hand meets the same resistance on all four, so no single voice jumps out of a chord.
The Aluminum E Is What Defines This Set
In set 15 the top string is wound with aluminum (art. 9), the lightest metal used anywhere in the line. Low winding mass means the E answers the bow immediately and sounds rounder, less edgy than the chrome version. Tension on the chrome E (art. 8) is identical at 7.8 kp, so choosing between sets 15 and 15A changes nothing about the load on bridge and soundpost — only the character of the first string. A wound E also does not slip under the fingertip the way bare steel wire does, which makes vibrato easier to hold.
Steel Rope Core: Clean Fifths and a Long Life
A multi-strand cable bends more easily than solid wire of the same section, which is why Thomastik claims "excellent purity of open fifths" for the line: the string seats flat over nut and bridge with no hidden stresses to pull the fifth off. The second practical consequence is tuning stability — a steel core ignores humidity and temperature swings, so the set does not need chasing with the pegs after an aired-out classroom or a cold hall. Service life is long: these strings get replaced because the winding wears, not because the sound has drifted away.
Specifications
| Purpose | Violin string set |
| Line | Superflexible |
| Size | 4/4 (full) |
| Gauge | medium (mittel) |
| Vibrating length | 32.5 cm (12.8") |
| Core | Steel rope core — the same on all four strings |
| E string | Aluminum winding, brass crimp ball end, 7.8 kp (17.2 lb), art. 9 |
| A string | Chrome winding, brass crimp ball end, 6.5 kp (14.3 lb), art. 10 |
| D string | Chrome winding, copper crimp ball end, 5.9 kp (13.0 lb), art. 12 |
| G string | Chrome winding, nickel crimp ball end, 5.5 kp (12.1 lb), art. 13 |
| Total tension | 25.7 kp (56.6 lb) — Thomastik publishes tension in kilograms (kg = kp) and pounds |
| Related set | 15A — same combination but with a chrome-wound E (art. 8); total tension also 25.7 kp |
| Thomastik article | 15 |
| Included | 4 strings in official Thomastik-Infeld packaging, each marked with its article number |
| Country of Manufacture | Austria, Vienna (Thomastik-Infeld has been developing and producing strings in Vienna since 1919) |
What's Included
The pack holds four strings — E 9, A 10, D 12 and G 13, each in its own Thomastik-Infeld envelope with the article number. That is everything needed to restring the instrument from scratch; nothing else has to be ordered alongside it.
Who It's For
For the orchestral player who needs predictable pitch through long services; for the teacher or student who plays every day and does not want to restring every few months; and for the owner of an instrument that sounds too soft under synthetics and asks for a denser steel foundation.
Frequently Asked Questions
What exactly is in set 15?
Four 4/4 strings in medium gauge on a steel rope core: E 9 with an aluminum winding (7.8 kp), A 10 chrome (6.5 kp), D 12 chrome (5.9 kp) and G 13 chrome (5.5 kp). All four have crimp ball ends.
What is the total tension and are other gauges available?
25.7 kp (56.6 lb) in medium. Thomastik's official table also listed this set in light — 23.1 kp (50.9 lb) and heavy — 27.2 kp (59.9 lb), but the 2026 site publishes medium only for 4/4.
How does set 15 differ from 15A?
By the E string only: set 15 uses the aluminum-wound E (art. 9), set 15A the chrome-wound one (art. 8). A 10, D 12 and G 13 are the same in both, and both E strings pull 7.8 kp, so the 25.7 kp total is identical.
What string ends does the set use?
All four strings, the E included, have a crimp ball end — it is not removable, and Thomastik does not publish a loop-end version of the Superflexible violin strings. The ball metal identifies the string: brass on E and A, copper on D, nickel on G.
Can I buy the strings from this set one at a time?
Yes, all four articles are sold separately — 9, 10, 12 and 13 at the same tensions, so replacing a single string does not tilt the balance of the set. The G also exists as a silver-wound version (art. 14) at the same 5.5 kp.
Are these genuine Thomastik strings?
Yes. SoundsGood supplies only genuine Thomastik-Infeld product in official packaging marked with article numbers.
🚚 Shipping and Payment
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✅ Quality guarantee — genuine strings only
🏪 Pickup — Kyiv, free
🚚 Nova Poshta / Ukrposhta / Meest — 1–3 days
💳 Installments — PrivatBank, Monobank
🎻 Order the Superflexible 15 set at SoundsGood! ⚡