Spirocore S38 Bass A String: Medium

The Spirocore S38 Bass A String: Medium is a premium replacement string for double bass players who want fast response, strong projection, and the lasting durability that has made Spirocore a longtime standard. Thomastik-Infeld lists the S38 as the medium-tension A string for 4/4 double bass in its Spirocore Orchestra line, a series known for its spiral core construction and dependable performance across demanding orchestral and general performance use.

Built with Thomastik's Spiralcore construction and chrome outer material, the S38 is designed to deliver the focused, lively feel bassists expect from Spirocore. The official product listing also specifies an aluminum ball and crimp ball end, helping confirm compatibility with standard tailpiece setups. For players looking for a full-size upright bass A string with a clear, responsive character and a well-established professional reputation, the S38 remains one of the core Spirocore options in the line.

Features & Specifications

• Instrument Fit: Designed for 4/4 double bass.
• String: A string, listed as La1 III.
• Tension: Medium tension.
• Manufacturer Model: Thomastik-Infeld S38.
• Core Material: Spiralcore construction.
• Winding Material: Chrome outer material.
• Ball Material: Aluminum ball.
• Tailpiece End: Crimp ball end.
• Tension Value: 34 kg / 74.96 lb.
• Line: Part of the Spirocore Orchestra double bass series.
• Use Case: Well suited to players seeking a premium orchestral bass string with a responsive, durable feel. This is an inference based on the published construction and product positioning.
• Manufacture: Thomastik-Infeld states its strings are developed and produced in Vienna.