Thomastik: Spirocore S42 Individual Double Bass Strings

(1 customer review)



Individual Thomastik Spirocore S42 Double Bass Strings, EADG, Available in Medium, Light, and Heavy


Thomastik Spirocore S42 Individual Double Bass Strings. Make your selection above for E, A, D, G individual strings: available in Light (Weich), Medium (Mittel), or Heavy (Stark) tensions.


Pricing varies by string selection. Most players use Medium, but if you are unsure which tension you need, compare the thread color key below with your current string or give us a call. Upton Bass also sells Spirocore S42 full sets.

Thomastik Spirocore S42 Double Bass strings are a further technical development of the Kunstler Seil series and have a flexible multi-wire spiral steel core. This core has greater elasticity than that of conventional strings, which means less inertia and a higher propensity to musical vibration. The sound is full and homogenous, balanced and voluminous. Equally effective when playing pizzicato or arco, Thomastik Spirocore S42 Double Bass Strings are highly responsive, long lasting strings that are legendary for their distinctive tone and playability.


  • Classic, legendary dark sound
  • Suitable for arco and pizzicato
  • Responsive to the bow
  • Low tension string with maximum growl

Tension/Thread Color Key:

  • S42Light/Weich = Red Bottom,Purple Top
  • S42 Medium/Mittel = Red Bottom, Red Top
  • S42 Heavy/Stark = Red Bottom, Green Top
  • S43 Solo = Red Bottom, Yellow Top


Upton Bass is a double bass specialty company located in Mystic, Connecticut. We are ready to offer advice and answer any questions you have regarding your double bass, Individual Thomastik Spirocore S42 Strings or other strings for your double bass, or related topics. Any questions? Email or call our shop at (860) 535-9399. Our hours of operation are Tuesday through Saturday 10 am – 6 pm.

1 review for Thomastik: Spirocore S42 Individual Double Bass Strings

  1. Corey R Contat

    I use the Spiro string for both Orchestral and Jazz! Yeah that sounds a little off the charts but here’s why. This is a very bright sounding string that really has a mean sounding growl when bowed (arco). Bow friendly it is not, however with a little practice and patience and a little more rosin it is deep sounding. As far as playing pizz, Spiros speak for them selfs. Awesome old school Jazz twang and sustain which makes a great vibrato. It a little rough at first but give it a few weeks or so and you are golden. Hope that helps.

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