This is a single "C" string/ extended "E", medium tension.
Kaplan strings have a medium tension feel and pretty quick bow response, while adding little or no 'color' to the tone. Like a good studio monitor, just the inherent voice of your bass comes through. Kaplan strings are USA made, very moderately priced, and are most compatible with high-end basses - those which have a very good natural tone and already have a lot of resonance. Suitable for orchestral playing. Kaplan strings work best on basses that already have plenty of natural volume/projection.
Not sure which strings to purchase? Check out our comprehensive guide!