The 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. Benefits •Metal-detectable ball bearing for high detectability. •Proprietary, premolded, triple-flange earplug design inserts easily. •Soft polymer is washable and reusable •Noise Reduction Rating (NRR)*: 25 dB. CSA Class AL •Test compatible with 3M™ E-A-Rfit™ Validation System