Tonica violin strings are the top of the line synthetic core string from Pirastro. The special synthetic core is made of the finest and most flexible single filaments along with high quality winding materials. These strings are constructed using the latest manufacturing techniques, including strict quality control. They feature great dependability, full and powerful volume, lively sound with a high degree of modulation, extremely quick response, and they tune immediately and are resistant to changes in humidity. Set No. 412023