D'Addario Prelude Viola String Set, Medium Scale, Medium Tension Medium-scale viola (body length 15-16 inches) with a playing length of 14 1/8 inches (360mm) Medium tension Solid steel core optimized to create the warmest-sounding student strings available Educator's preferred choice for student strings due to their unique blend of warm tone, economy, and durability All D'Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry