3M PELTOR X Series Helmet Attached Ear Muffs X5P3E The X5P3E earmuffs offer high NRR (31 dB) which makes them ideal for very high noise situations. The high attenuation delivered by X5P3E earmuffs is possible as a result of a combination of advanced technologies including: newly designed spacers, specially formulated foam liners and innovative foam contained in the cushions. Examples of typical applications include: metal processing, automotive, airports, construction, textile manufacturing, chemical and pharmaceutical, manufacturing, cement manufacturing, printing, woodworking, heavy engineering, foundry, steelworks, mining and quarrying. One size fits most.