Pirastro Chromcor Upright Bass StringsPirastro's Chromcor strings feature a single filament steel core with a chrome steel winding. They have a big tonal volume while producing a clear and very brilliant sound with an easy response. This makes the Chromcors especially great for fiddle style players as well as electric instruments. The chrome steel winding of the strings is anti corrosive especially to hand perspiration making these strings durable and long lasting. Chromcor Bass Strings