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. Econopack gives you the best value and a great choice for hearing protection in industries such as food and pharmaceutical processing. Soft polymer is washable and reusable. Single size fits comfortably in most earcanals. 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.