AIRSOFT (NRR27) features a shell of soft attenuating material around a pocket of air that is comfortable enough for extended wear. The highest rated reusable earplug available. Washes with soap and water for months of protection. Attenuation tested in accordance with ANSI S3.19-1974. Blue color.Available in clear flip-top boxes or safety impact cases, packed in a dispenser box. Ratings: NRR 27, SNR 30 , SLC80 (corded) 21.0, SLC80 (uncorded) 21.5, CSA A(L)