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A warm, mellow tone that breaks in quickly. Pro-Arte synthetic core cello D strings have a warm, mellow tone, are less sensitive to humidity and temperature changes, and break in quickly. Pro-Arte D strings are manufactured at a lower tension in order to maximize bow response, tonal blend and playability. Pro-Arte is a perfect choice for players seeking a warm, dark tone. Scaled to fit 4/4 size down to size these, medium tension strings are optimized to the needs of a majority of players. All D\’Addario strings are designed, engineered and manufactured in the USA to the most stringent quality controls in the industry.