D'Addario Cello Helicore Heavy 4/4 Titanium Wound D, H512-H

"Helicore strings are crafted with a multi-strand twisted steel core and wound with exotic metals like titanium (used here for the first time in bowed instrument strings). These innovative materials have enabled us to design strings with a very small diameter to provided extremely quick bow response. The application of damping resins under selected windings gives the Helicores a warm, rich sound, quite unlike steel strings of the past. The strings are subtle under the ear, yet carry great projection in large concert halls. Helicores stay in tune especially well due to their cores, and retain a very long playing life. They are available in complete sets or individually for violin, viola, cello and bass."