TI is part of the Thomastik-Infeld luthier line! These strings were created for the sophisticated violinist and to meet professional needs of luthiers. TI strings work with many different instruments and playing styles, but are particularly popular among chamber musicians and orchestra players. The TI100 set includes an aluminum wound D-string, ideal for dark sounding instruments demanding more brilliance. It also delights with an excellent bow response. Additionally, a silver D-string is available for those looking for less bow noise and a warmer sound. The diameter of the silver D is significantly thinner than the aluminum wound D.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.