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E String Thomastik Superflexible 4/4 for Violin (Aluminum-Wound)
Article 9 is the Superflexible E with an aluminum winding — the lightest metal Thomastik uses anywhere in this line. The core is the series standard, a steel rope core that the maker describes as "reducing stiffness and improving elasticity"; tension is 7.8 kp (17.2 lb), gauge medium, size 4/4, with a brass crimp ball end. This is the E fitted in set 15, so the string suits both refreshing the top of that set and buying on its own. The low winding mass is audible immediately: the top answers the bow without delay and sounds rounder than the chrome version.

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Aluminum Is the Lightest Metal in the Line
A winding adds mass, and mass means inertia: the more of it, the longer a string takes to get moving from the moment the hair touches it. Aluminum is the lightest of the metals used here, so this is the E on which the top register speaks fastest, with a round attack and no harsh metallic edge. It shows up most clearly in fast figures high on the string: the first notes of a run do not smear, and the phrase stays legible to the end.
The Same Tension as the Chrome E
Aluminum 9 and chrome 8 pull identically at 7.8 kp, which is handier than it sounds. Swapping one for the other changes neither the load on the bridge, nor the soundpost setting, nor the familiar feel under the left hand — only the timbre of the first voice. That makes the choice between set 15 (aluminum E) and 15A (chrome E) purely a matter of taste, and trying both costs one single string rather than a second full set.
A Steel Core: Long Life and Indifference to Weather
Thomastik puts it plainly for the line: "impressive durability and tuning stability make them very dependable all-around strings". For the top string that matters most, since it is usually the first to go in a set. A steel rope core does not stretch with humidity or react to temperature swings, so the E does not drift after an aired-out classroom; you replace it when the winding wears, not when the pitch wanders. The end is a brass crimp ball, not removable — brass belongs to E and A throughout the line.
Specifications
| Purpose | Single E string for violin |
| Line | Superflexible |
| Note | E (e² / mi² / I string) |
| Size | 4/4 |
| Gauge | medium (mittel) |
| Tension | 7.8 kp (17.2 lb) — Thomastik publishes tension in kilograms (kg = kp) and pounds |
| Core | Steel rope core |
| Winding | Aluminum |
| End | Brass crimp ball end |
| Vibrating length | 32.5 cm (12.8") |
| Alternative winding | Art. 8 — the same E with a chrome winding, also 7.8 kp |
| Used in set | 15 (aluminum E plus chrome A, D and G, 25.7 kp total) |
| Thomastik article | 9 |
| 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 E string in an official Thomastik-Infeld envelope marked with article 9 and its gauge. Sold singly — as the replacement top for a set 15 or as a single E for any ball-end tailpiece.
Who It's For
For the player who wants a warm, round top without metallic edge; for anyone whose steel set has an E that sounds too bright; and for the owner of a set 15 who replaces the first voice more often than the other three.
Frequently Asked Questions
What is the article number and what is this string wound with?
Article 9 — a Superflexible E on a steel rope core with an aluminum winding, medium gauge, 4/4 size, 7.8 kp (17.2 lb), finished with a brass crimp ball end.
How does E 9 differ from E 8?
By winding metal: 9 is aluminum, 8 is chrome. Tension is the same (7.8 kp), as are core and gauge, so the difference is purely tonal — aluminum gives a rounder, warmer attack, chrome a denser, harder surface with a brighter edge.
Is this E available in other gauges?
Thomastik's official table lists three: light 7.3 kp (16.1 lb, code 9W), medium 7.8 kp and heavy 8.0 kp (17.6 lb, printed as "9 st"). The 2026 site publishes medium only for 4/4.
Which set uses this string?
Set 15: aluminum E 9 plus chrome A 10, D 12 and G 13, totalling 25.7 kp. In 1/2 size the equivalent aluminum E is article 510, from set 514.
What end does it have?
A brass crimp ball end that does not come off. Thomastik publishes no loop-end E for the Superflexible violin line, so a ball-end tailpiece or fine tuner is required.
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 Superflexible aluminum E string at SoundsGood! ⚡