The Sonis range of ear defenders have been designed by working with a leading UK acoustic engineering research facility to develop an ear defender range that peaks at an unbeaten 37 SNR. Hygienic, customisable and colour coded range for easy selection. Sonis 1 Features: -Use to block out moderate industrial noise -Suitable for workshops, printing works, landscaping, leisure activities etc Sonis 2 Features: -Use to block out substantial industrial noise -Suitable for roadworks, printing works, forestry, engineering Sonis 3 Features: -Use to block out extreme industrial noise -Suitable for aircraft, quarrying, paper mills and heavy engineering Sonis Compact Features: -Use to block out substantial industrial noise -Suitable for construction & agricultural machinery, roadworks, forestry and engineering