D’Addario Helicore cello strings are crafted with a multi-stranded steel core, resulting in optimal playability while producing a clear, warm tone. The smaller string diameter provides quick bow response. Premium quality materials combined with skilled workmanship produces strings known for excellent pitch stability and longevity. These strings are optimized to the needs of a majority of players. Helicore cello strings are versatile strings that work well for a wide variety of playing styles and instruments including: orchestral, electric, jazz, fiddle, and pop.