3M™ E-A-R™ UltraFit™ corded earplugs features a proprietary, premolded, triple-flange design that fits comfortably in most earcanals. Metal-detectable ball bearing for high detectability. Soft polymer is washable and reusable. Single size fits comfortably in most earcanals. Poly bag keeps each pair or earplugs available or accessible for re-use. Noise Reduction Rating (NRR)*: 25 dB. CSA Class AL. *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.