DOUBLE BASS STRING Daddario String Double Bass Hel.hyb.g Hh612 1/2 Med. Helicore orchestral strings for double bass are made with a core made up of several braided steel threads, producing a moderate and warm tone quality. The heart design makes the strings very easy to play under the left hand. The string's damping has been optimized to create a good balance between sustain in pizzicatos and response when playing with the bow, giving us great response in many different styles, from symphonic styles to jazz or bluegrass.