"3M E-A-Rsoft Yellow Blasts are the softest, smoothest, highest NRR earplugs. Expands slowly to fit virtually any ear canal. 200 pair per box. NRR 32dB. Noise Reduction Rating NRR dB 32, Pairs qty. 200, Battery Required No, Disposable Yes, AM/FM Radio No, Case Included No, Hearing Protector Type Earplugs."