D'Addario Pacato Hearing Protection is a reusable, universally-
sized audio filter designed specifically for musicians and music
enthusiasts. While other hearing protection can sound muffled and
unnatural, the Pacato filters provide full frequency, enjoyable audio at
safe listening levels. The exclusive design offers an open air passage
to the ear, minimizing occlusion effect (low frequency emphasis), while
keeping the ear ventilated for unmatched comfort. Instructions included.