D'Addario Pro-Arte Viola Single A String, Medium Scale, Medium Tension Medium-scale viola (body length 15-15 3/4 inches) with a playing length of 14 1/8 inches (360mm) 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