Set / Violin 4/4 Gauge: mediume” steel,ball enda’, d’, g steel/pure nickel flatwoundOptimaProtos Violin (formerly Lenzner Protos) – Steel core strings, flatwound with fine pure nickel flat wire, delivering an extremely good playability and anexcellent sound. The strings are perfect for students as well as for artists. The well-known violin virtuoso Roby Lakatos is convinced of this brand and prefers playing with PROTOS strings. These flatwound strings have a very smooth surface, are easy to play and have agood response. The strings offer a brilliant and soft sound. Because of its special string construction they do not sound hard or “metallic” at all.