Thomastik Precision double bass strings or Präzision double bass strings, as they’re otherwise known, have a solid steel core and produce a beautiful sound with brilliance. They are very durable, have a long lifespan and present a budget solution for players in all fields.
Other strings to consider are D’Addario Prelude as a budget all-rounder. D’Addario Helicore Orchestral are also a good option for Orchestral players.