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Strings for Double BassStrings for 1/2 and 1/4 size basses
Strings for Double BassStrings for 3/4 and 4/4 size Basses

Thomastik Spirocore Upright Bass Strings

         Manufactured by: Thomastik

Continental US - larger items may carry a partial shipping charge to AK, HI and PR
All shoppers outside the US State of New Jersey pay NO SALES TAX on any purchases at Gollihur Music. (NJ Residents pay NJ State Sales Tax of 7%.) International customers, please visit our "How to Order" Policies page for information concerning VAT and Customs Charges that may be assessed by your country and/or delivery services.
You've got options! Click the drop-down to choose (prices starting at $219.99)
Choose String SET:
(Singles? Click box below):
-- Select Individual Thomastik Spirocore Upright Bass Strings

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(Note that larger items may carry a partial shipping charge to AK, HI and PR.)
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Thomastik SpirocoreSpiros are an old favorite for jazz and other genres and has been a popular string for many years. They were one of the first decent metal strings to be adopted by strictly gut string players-- in fact, lots and lots of us played G & D guts and A & E Spirocores, since the larger gut strings of the mid-20th century still were too indefinite and flabby for good jazz articulation.

They have great sustain and a big sound good for many styles, but remain a jazz favorite. You'll also find them on lots of general use basses, for bluegrass, blues, and other styles where that big sound and sustain are prized. While they are certainly used by many fine arco players, they have a reputation for a scratchy sort of response under the bow -- and their stiffness requires an attention to proper technique. So if you bow a lot, and not strictly acoustically (scratchiness is particularly obvious when amplified), consider that reputation. I have used them sucessfully with magnetic pickups.

We carry the standard "Medium" Spirocores, as well as the Weich, or light weight gauge, which are more flexible and lighter. The modern string packages say "Orchestra," which refers to conventional orchestra tuning. We also carry the "Red Mitchell" Signature set, which is a set for tuning in 5ths, which is favored by some players.

Trying to replace the Spirocore strings you already have? Spirocore Medium (Regular Gauge) have RED windings at both the tuner end and ball end of the string - while the Weich (light) gauge strings have a PURPLE winding at the tuner end and RED winding at the ball end.

Note about S42 and 3885 sets:

The Spirocores are available in many different sizes and tensions. The most popular sets are the S42 variant; they are designed to be used on 3/4 and 4/4 size basses. If you have Spiros on your bass, chances are very good that they are the S42/S42W set. However, Thomastik also makes a 3/4 specific set, designated the 3885, which is very specifically sized and designed for optimal tension on a 3/4 size bass.

Don't know which one to get? Get the S42 variant -- they are, far and away, the most popular (and what you'll end up with if you buy from a store that doesn't specify). Only very particular players bother with the 3885, as the difference is quite minimal to most of us.


String Gauges:

Medium S42 (Mittel)
G D A E
.051 .068 .082 .110
Solo S43
G D A E
.044 .061 .076 .103
Weich S42W
G D A E
.046 .063 .079 .107
Stark S42ST
G D A E
.054 .065 .095 .120


This string is also available as a "Bumped" String Set. To find out more about bumped sets (with options for purchase) click here!




We source our Thomastik-Infeld strings directly from the factory-authorized US Distributor, and they are the real deal. Only legitimately sourced strings are certified for sale by US dealers. Buying your guaranteed authentic Thomastik strings from us means that you can be confident that you'll have the support of the manufacturer AND us here at Gollihur Music.


  • longtime jazz standard
  • big sound
  • long sustain
  • kind of scratchy for bowing


Is this product returnable? Click here for our return policy.
Is there a Factory Warranty? Click here to find Warranty Information for all of our manufacturers.
International customer? Click here for important information about ordering from outside the USA, and what to expect concerning taxes, VAT, delivery times, and more.



Check Out the FAQ Resources That Apply to This Product:
   STRINGS: Changing Strings on your Upright Bass
   STRINGS: String Identification Chart

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Some of our customers have told us what they think about this product.
Check out what they had to say!
I would like to thank you for the suggestion to pick up the Spirocores double bass strings. These strings are awesome. They are loud, have a great pizzicato sound, and really make my bass sing. These strings can really growl. I suggest anybody who plays mostly acoustic that these are your string. They also sound great going through my Bass Max pickup. So much tone, and definition. Thanks Bob and Mark once more for the great service.
Shawn Ruddy