D'Addario Helicore Cello Single A String, 1/2 Scale, Medium Tension 1/2 size cello with a playing length of 23 5/8 inches (600mm) Medium tension Stranded steel core provides optimum playability and produces a clear, warm tone Versatile string that works well for a wide variety of playing styles and instruments All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry