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D'Addario EJ51's feature polished basses for reduced finger noise, making them ideal for recording. These hard tension strings are a popular choice for their rich tone, increased resistance, and strong projection. All Pro-Art treble strings are computer controlled by an X-Y laser microscope which performs diameter and tension measurements, ensuring true-sounding, precise trebles in every set. Pro-Art basses are wound using silver-plated copper on a multi-filament nylon core for consistent and warm, yet projecting tone.