SPIROCORE cello string SET by Thomastik-Infeld

SPIROCORE S31 Cello String Set – Legendary Sound, Maximum Performance

With SPIROCORE strings, Thomastik-Infeld perfected a groundbreaking innovation as early as 1957: the ultra-flexible metal spiral core. To this day, these strings rank among the most widely used cello strings worldwide – thanks to their unmatched responsiveness, exceptional lifespan, and distinctive, powerful tone.

The SPIROCORE S31 set is designed for demanding cellists who rely on strong projection, reliable tuning stability, and precise control – whether performing solo, in an orchestra, or in the studio.

Technology that delivers

The unique spiral core ensures maximum elasticity and an exceptionally fast, direct response. Combined with chrome winding, it produces a clear, brilliant yet warm and powerful tone with impressive depth and projection.

Perfectly matched set (S31)

• S25 A string (La I) – with brass content (MS), brilliant and highly responsive
• S27 D string (Re II) – warm, balanced, and stable
• S28 G string (Sol III) – powerful with rich tonal body
• S29 C string (Do IV) – deep, resonant, and full-bodied

All strings feature a ball end for easy and secure installation.

Optimal tension – versatile performance

With a total tension of 56.6 kg (124.8 lb) in medium gauge, this set offers the perfect balance between playing comfort and sound volume – ideal for a wide range of musical styles and requirements.

Also available for smaller instruments

SPIROCORE cello strings are not only available for 4/4 cellos, but also for smaller instruments in sizes 3/4 to 1/4 – perfect for students and compact instruments without compromising on sound quality.

Key benefits at a glance

• Legendary, powerful and projecting tone
• Extremely fast response
• Outstanding durability and tuning stability
• Rich, full sound across all registers
• Available for multiple instrument sizes