Thomastik-Infeld Spirocore Cello C String, 4/4 Size, Medium Tension - S33 - Spiral Core, Tungsten wound - Powerful & Focused Tone, Deeply Resonant, Reference Standard
| Country | USA |
| Manufacturer | Helikon Publishing |
| Binding | Kindle Edition |
| ReleaseDate | 2025-04-25 |
| Format | Kindle eBook |