Pirastro Chromcor 4/4 Violin String Set (E-Ball)Pirastro Chromcor strings are made of steel, feature a very clear and brilliant sound, and have exceptional lasting power. Features: Chromcor strings have a single filament steel core wound with chrome steel. clear and very brilliant sound, warmer than Piranito big tonal volume Suitable for all musicians, esp. for fiddler searching for clear and brilliant sound. very easy response Chromcor strings are wound with chrome steel and are therefore long