Warwick Black Label Stainless Medium 4-String Bass Strings ONE set! $17.99. buyer pays shipping from AZ.85937 Warwick's top-of-the-line strings. Gauges 45-65-85-105. Medium. Black Labels are the strings Warwick ships with every Warwick bass. They are exceptionally responsive, sparklingly clear, rich in deep tones, and will never disappoint even the most demanding of seasoned bass players. more than one set is available !