Pirastro describes the Tonicas as follows:
- Tonica strings have a core made from nylon.
- They produce a lively well-rounded sound, perfectly balanced across all four strings.
- Responding instantly to any bowing style, they reward both player and listener with an open and direct sound.
- With substantially reduced background 'hiss', players can sustain a more even tone helping to achieve smoother string crossings.
- With a highly responsive left hand feel, Tonica strings remain very easy to play all the way up to the highest positions.