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Howard Leight Thunder® T3 Black Over-The-Head Noise Blocking Earmuffs with 30 dB NRR have dielectric construction and enhances worker safety by blocking noise in electrical environments. Plastic earmuffs feature a patented airflow Control™ technology for optimal attenuation across all frequencies and a unique dual headband for proper positioning and breathability. Earmuffs have headband with a non-deforming outer construction to withstand rough treatment in the toughest workplaces while minimizing pressure on the head. They come with a uniform headband pressure assuring a better comfort for all head sizes and support long-term wear. Earmuffs have snap-in ear cushions that make replacement fast and convenient and feature a quick click height adjustment.