E String Thomastik Spirocore 4/4 for Violin

This is the top voice of the Spirocore line — article S9 — and its defining feature is that it is not a bare steel wire. Inside runs a spiral steel rope core (Spiral core in Thomastik's own documentation) and over it sits an aluminum winding that changes both the feel under the fingertip and the shape of the attack. Tension is 7.5 kp (16.53 lb) in medium gauge, size 4/4, finished with a brass crimp ball. It is the same E that ships inside set S15, so it works equally well as a replacement for a worn top string or as a standalone purchase. The tone comes out bright and precise, without the metallic harshness of plain steel.

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An Attack That Never Lags

The E carries the intelligibility of the whole upper register: if the string answers late, the first notes of a fast figure smear even with a flawless left hand. A spiral rope core has less inertia than solid wire, so sound appears virtually the moment the hair meets the string. You hear it most in detache and martele — every note starts with a defined edge rather than a soft swell, and the passage stays readable down to the last sixteenth.

Aluminum Winding Against Whistling

A bare steel E has a well-known vice: under heavy pressure, or when the bow is not quite perpendicular, it slips into a whistle. The aluminum winding gives the bow hair more grip and takes a little edge off the upper partials, so the string stays controllable even at forte in high positions. It also feels like a real surface under the fingertip rather than a thin wire, so the pad does not slide during vibrato. If you want the sharpest, most cutting top instead, the line offers a chrome-wound counterpart at identical tension — article S8.

7.5 kp and a Brass Ball

In set S15 this is the tightest of the four strings — 7.5 kp of the 23.1 kp total — and that reserve is what keeps the top focused under pressure. The end is a brass crimp ball: it is not removable, so the string goes into the tailpiece as it is, and in Spirocore the brass colour belongs to E and A, which makes it easy to tell strings apart in the envelope and to spot the genuine article. Steel gives long service: sweat and humidity swings do not bother it, so you replace this string when it is worn, not when the weather turns.

Specifications

What's Included

One E string in a branded Thomastik-Infeld envelope carrying article number S9 and the gauge marking. Sold singly, as a replacement for a worn top string or to complete the rest of a set.

Who It's For

For the player who wears out an E faster than the other three strings, for anyone who finds a bare steel top too shrill and prone to whistling, and for owners of set S15 who only need to refresh the first voice.

Frequently Asked Questions

🚚 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

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