JSP Sonis 1 Helmet Mounted Ear Defenders - SNR 26 The Sonis® range of ear defenders have been 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 SNR 26 Low attenuation small cup 80-107 DB Moderate industrial noise Workshops Printing works Landscaping Leisure activities Hygienic Customisation Colour Coding for easy selectionJSP JSP Sonis 1 Helmet Mounted Ear Defenders - SNR 26 | Work & Wear Direct