3M peltor optime 95 earmuffs h6b/v, behind-the-head, nrr 21 db specifications: for noise levels up to 95 dba. Stainless steel construction resists bending and warping. Earcup pivot points tilt for optimum comfort and efficiency. Noise reduction rating nrr: 21db. Csa class b. 3M peltor optime 95 behind-the-head earmuffs feature low-profile earcups that fit well with most helmets, eyewear and other safety equipment. Provides effective hearing protection against high-frequency noise.