Larsen Virtuoso violin A strings have a moderate tension capable of rich, nuanced sound with exceptional volume. Available in medium or heavy tensions with a ball end, Virtuoso A strings are well suited for warm- to neutral- sounding instruments. The heavy tension allows for a focused, soloistic sound with higher bow resistance, while the medium tension offers great response, playability and sound modulation. Larsen Virtuoso violin A strings are made from a pioneering synthetic multi-filament core wound with aluminum.