The Deci 4200 Disposable Earplug offers comfort plus the highest Noise Reduction Rating (NRR) available at 33dB. With a tapered shape and rounded end, North’s Deci 4200 is easier to insert into the ear canal than past generation earplugs. Soft polyurethane foam gently expands to fill the ear canal comfortably and maximize protection against noise. Corded and un-corded versions are available.