Rondo is part of the Thomastik-Infeld luthier line! These strings were created for the sophisticated violinist and to meet the professional needs of luthiers. Rondo strings work on many different instruments but are particulary popular among soloists playing old instruments. The RO100 set comes with a synthetic core, aluminium 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.