Thomastik-Infeld describes the Rondo strings as follows: RONDO FOR VIOLIN
Great balance of warmth and brilliance
Vast dynamic range
Immediate bow response
Reduces wolf tone
Rondo violin strings work on many different instruments but are particularly popular among soloists playing old instruments. The (standard) set comes with a synthetic core, aluminum wound A-string, providing great modulation and a rich spectrum of sound colors. For those wanting to stay true to the traditional steel A-string or looking for 100% corrosion resistance and easier playability, Rondo offers a steel A-string without the common downsides of sounding too bright or shrill.