Thomastik Violin Rondo SetRondo 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. Great balance of warmth and brilliance