Isolation Tailored for you Our custom ear plugs utilize interchangeable, removable filters that let you adjust the level of isolation to fit your needs. Choose the filter that best suits your application. Filters fit all MEE audio earplugs with interchangeable filters (custom and universal-fit). Filter Dimensions (diameter x height): 6.45 x 3.5 mm. For other earplugs, please check fitment compatibility before purchasing. 5 dB Filter Reduces damaging higher frequencies while allowing most sound through Perfect for: Swimming Sports activities that require ambient awareness 15 dB Filter Balanced performance with an emphasis on reducing higher frequenciesPerfect for: Everyday use around sources of moderate noise 10 db Flat Response Filter -9 dB from 125 Hz to 2 kHz, -13 dB from 2 kHz to 8 kHz Perfect for: Bass players/drummers who want to filter out high frequencies but still have a solid bottom end response 15 db Flat Response Filter -15 dB flat linear response from 125 Hz to 8 kHzPerfect for: Concert goers who want a full-fidelity experience without damaging their hearing Engineers or producers who want to maintain a flat response at a lower volume level in the studio Guitar players/singers that want a linear response at a lower level 25 db Flat Response Filter -25 dB from 125 Hz to 2 kHz, -20 dB from from 3 kHz to 6 kHz, -25 db at 8 kHzPerfect for: Concert goers who want added protection with clarity at higher frequencies Guitar players/singers who need to filter out more bottom end while maintaining crisp highs