Helicore Hybrid bass strings are multi-stranded steel core strings that produce a moderately 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. Scaled to fit 3/4 size bass with a playing length of 41 3/4 inches (1060mm), these medium tension strings are optimized for a majority of players. 3/4 size bass with a playing length of 41 3/4 inches (1060mm). Medium tension. Stranded steel core provides optimum playability and produces a clear, warm tone. Good balance between pizzicato sustain and bow response. All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry.