The X-Series earmuffs are 3M's latest advancement in hearing conservation. New technologies in comfort, design and protection all come together in this groundbreaking earmuff line. The X5P3E earmuffs offer the highest NRR (31 dB) for an earmuff on the market - 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. Noise Reduction Rating (NRR)a 31 dB. CSA Class AL. The NRR may overestimate the hearing protection provided during typical use. Hearing protection solutions made innovatively easy. The 3M Peltor X series earmuffs are ideal for protection against noise arising from a wide range of applications in the workplace and leisure activity. 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. Headband and headband cover/sleeve: stainless steel wire, TPE, polyester, polypropylene, acetal. Hard hat attachment arm: stainless steel wire, acetal, polyamide. Earcups: ABS/TPU. Earcup inserts: PU foam. Earcup cushions and cushion covers: PU foam and PVC. Black color. Hearing protection style: hard hat attached. Noise reduction rating: 31 decibel. Product type: earmuffs. Size: one size fits most.