We currently do not offer a bass set tuned in fifths. However, you can create a set from existing strings.
We recommend the following:
A: Use Helicore or Kaplan Solo A, HS611 3/4M
D: Use Helicore or Kaplan Orchestral D, H612 3/4M
G: Use Helicore or Kaplan Solo F#, HS614 3/4M tuned to G
C: Use Helicore or Kaplan Orchestral Low B, H616 3/4M tuned to C.
NOTE: The A, D, and C strings recommended above work very well for this application, with excellent matching. However, the tension of the G-string is very high compared to the rest of the set.