D'Addario Helicore Fourths-Tuning Cello A-String, 4/4 Scale, Medium TensionScaled to fit 4 4 size cello with a playing length of 27 1 2 inches (700mm), these medium tension strings are optimized to the needs of a majority of players. The Helicore Fourths Tuning Cello Set is designed to be tuned in bass tuning (E, A, D, G low to high). This tuning pattern allows for a whole world of new chordal and scalar possibilities in alternative cello playing. It also provides a way for bass and guitar players to more quickly adapt to