Check the listing for details. Thomastik-Infeld BC64 Belcanto Orchestra Double Bass E String - 3/4 Size, Medium. Condition: New. Listed at 132.17 USD. Unlock a Symphony of Tonal Colors Classical double bass players need strings that settle in quickly and intonate well. That's why so many musicians turn to Thomastik-Infeld — their cutting-edge Belcanto double bass strings do both. Belcanto strings feature twisted steel rope cores, and they deliver a dark, warm sound with out-of-this-world resonance and excellent projection. Double bass players at Sweetwater have found Belcanto strings to facilitate a wide range of tonal colors. Tailor-made for smooth arco techniques, these strings make everything you play sound amazing. Thomastik-Infeld has produced high-end orchestral and fretted instrument strings for more than 100 years, and Belcanto double bass strings epitomize the quality of their products.