"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. Battery Required No, Case Included No, Disposable Yes, Hearing Protector Type Earplugs, AM/FM Radio No, Noise Reduction Rating NRR dB 32, Pairs qty. 200."