D'Addario Pro-Arte Viola String Set, Long Scale, Medium Tension Long-scale viola (body length 16-16 1/2 inches) with a playing length of 15 inches (380mm) Medium tension Synthetic core produces a warm, mellow tone Less sensitive to humidity and temperature changes, and break in quickly All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry