D'Addario HH610-34L double bass string set 3/4, light, nickelD'Addario HH610 34L double bass string set 3 4, light, nickel Helicore Hybrid bass strings are multi stranded steel core strings that produce a moderatly warm tone quality. The core design makes for strings that are very easy to play under the left hand. Damping is optimized to create a good balance between pizzicato sustain and bow response, allowing for good performance across many playing styles, from symphonic to jazz or bluegrass.