Comfortable silicone ear protectors. They filter noise in all frequency bands and dampen up to 18 dB and protect hearing from damage. The resulting sound with Thunderplugs hearing protectors will be softer, but the intensity is evenly suppressed at all frequencies. Protectors are almost invisible in the ear and very comfortable for long-term wearing. If you move around clubs and festivals where noise levels often exceed 100 dB, Thunderplugs hearing protectors will provide you with a reliable hearing protection feature with minimal impact on the quality of your music experience. The Duopack pack contains 4 silicone protectors and a practical storage bottle that you can attach to the keys.