Peltor optime 98 earmuffs, over-the-head, h9a a versatile, over-the-head earmuffs featuring a stainless steel headband for consistent force and effective hearing protection for noise levels up to 98 dba. – 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*: 25 db. Csa class a. *the nrr may overestimate the hearing protection provided during typical use. 3Mrecommends reducing the nrr by 50% for estimating the amount of noise reduction provided. 3Mis leading the advancement of hearing conservation.