Details Designed by the JSP R&D team. Working with a leading UK acoustic engineering research facility they have developed an ear defender range that peaks at an unbeaten 37 SNR. Features & Benefits BSI Approved SNR 36. High attenuation large cup 112-117dB. Extreme industrial noise (Aircraft, Quarrying, Paper mills, Heavy engineering).Hygienic. Customisation. Colour Coding for easy selection. JSP AEB040-0C1-A00 Sonis® 3 Helmet Mounted Ear Defenders (SNR 36)