Korpa 
Helicore Solo bass strings are tension-adjusted specifically for A-E-B-F# scordatura "solo" tuning, one whole-step higher than standard tuning. They are multi-stranded steel core strings that produce a warm tone quality with excellent bow response. The core design makes for strings that are very easy to play under the left hand. Damping is optimized for arco use, making them ideal for solo performance. Helicore Solo strings are scaled to fit 3/4 size bass with a playing length of 41 3/4 inches (1060mm).
HS610 3/4M Helicore Solo Bass 3/4 Scale Medium Tension Set