3M™ Peltor™ X4P5E Hard Hat Attached Earmuff, 10 EA/Case. The X Series earmuffs are 3M’s latest advancement in hearing conservation. New advanced design allow for use with full brim hard hats. New technologies in comfort, design and protection all come together in this groundbreaking earmuff line. The X4P5E is a light-weight, low profile earmuff designed for protection against mid-level industrial noise and other loud sounds. A universal mounting attachment fits most hard hats. Protects against arc flash and other electrical hazards with the electrically insulated attachments which offer consistent pressure over prolonged wearing periods. Earcup pivot points tilt for optimum comfort and efficiency. Replaceable ear cushions and foam liners (hygiene kit HYX4). Noise Reduction Rating (NRR)a 26 dB.