D'Addario NS Electric Cello String Set, 4/4 Scale, Medium Tension 4/4 size cello with a playing length of 27 1/2 inches (700mm) Medium tension Stranded steel core provides optimum playability and produces a clear, warm tone Designed for use on electric instruments but also suitable for acoustic All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry