Corelli CO-394-TX double bass string F#-4 4/4-3/4, TX-Series, heavy, solo, rope core, nickelCorelli CO 394 TX double bass string F# 4 4 4 3 4, TX Series, heavy, solo, rope core, nickel The TX series have been designed to enhance sound richness and clear projection. As a result of their thicker diameter, their high tension allows a more powerful attack, amplifying the response under the bow. Corelli's Nickel Soliste Series and Nickel Orchestre strings combine tradition and innovation. They present the same high acoustic qualities and benefit