Koss QZ-77 Active Noise Reduction Ear Plug SystemReduces harmful and annoying low frequency sounds in noisy environmentsSpecialty ear cushion material forms slowly in ear canal providing a custom fit and maximum isolationDynamic stereo phone element for extended frequency response (10 - 20, 000Hz)Reduces harmful and annoying low frequency sounds in noisy environmentsSpecialty ear cushion material forms slowly in ear canal providing a custom fit and maximum isolationReduces harmful and annoying low frequency sounds in noisy environmentsSpecialty ear cushion material forms slowly in ear canal providing a custom fit and maximum isolation
