D'Addario Kaplan Cello Single D String, 4/4 Scale, Light Tension 4/4 size cello with a playing length of 27 1/2 inches (700mm) Light tension Solid steel core provides clarity and projection while retaining warmth and balance Excellent projection, clarity and richness All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry