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 X1P3E is a lightweight, low profile earmuff designed for protection against low-level industrial noise and other loud sounds. - A universal mounting attachment fits most hard hats - Stainless steel band construction resists bending and warping to offer consistent - pressure over prolonged wearing periods - Earcup pivot points tilt for optimum comfort and efficiency - Replaceable ear cushions and foam liners (hygiene kit HYX1) - Noise Reduction Rating (NRR)a 21 dB. CSA Class B *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. Hearing Protection Solutions Made Innovatively Easy™.