Avit AV13011 Tapered Ear Plugs Protection are Ideal for all Workmen and DIY enthuasists working in noisy environments. Tapered shape for easy insertion and removal. Polymer foam compresses and expands for a perfect comfortable fit. Compliant with EN352-2. Technical Specification: Frequency 63Hz - Mean Attenuation 34.4dB - Standard Deviation 3.3dB - Assumed Protection 31.1dB Frequency 125Hz - Mean Attenuation 38.1dB - Standard Deviation 4.9dB - Assumed Protection 33.2dB Frequency 250Hz - Mean Attenuation 37.9dB - Standard Deviation 6.3dB - Assumed Protection 31.6dB Frequency 500Hz - Mean Attenuation 39.6dB - Standard Deviation 6.5dB - Assumed Protection 33.1dB Frequency 1000Hz - Mean Attenuation 37.7dB - Standard Deviation 4.2dB - Assumed Protection 33.5dB Frequency 2000Hz - Mean Attenuation 37.3dB - Standard Deviation 3.5dB - Assumed Protection 33.8dB Frequency 4000Hz - Mean Attenuation 48.4dB - Standard Deviation 5.1dB - Assumed Protection 43.3dB Frequency 8000H