3M™ Peltor™ Optime™ 95 cap mount earmuffs feature a universal mounting attachment that fits most hard hats. For noise levels up to 95 dBA. Universal mounting attachment fits most hard hats - stainless steel construction resists bending and warping. Earcup pivot points tilt for optimum comfort and efficiency. Ultra light with liquid/foam filled earmuff cushions. Color coding for compliance sighting. Noise reduction rating (NRR)- 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. 3M™ is leading the advancement of hearing Conservation™. Peltor™ 7000052743, Ultralight, Series: Optime™ 95, 21 dB Noise Reduction, Black/Beige, ABS, Specifications Met: CSA Class B, OSHA 29 CFR 1910.132