Made of deep-foamed polyurethane, conically moulded for best adaptation to the ear canal, smooth closed surface. SNR = 32 dB (A), H-value = 32 dB (A), M-value = 29 dB (A), L-value = 29 dB (A). Hearing protection is listed under category III (fatal or irreversible damage) according to the new PPE regulation. Before the first use and once a year thereafter, the employer must inform the employees of the prevailing noise hazard and instruct them on suitable protective measures.