Soft, conical tips swivel for easier fitting and greater comfort. – Silicone tips contain a foam core for an effective seal and good noise reduction. – Flexible band can be worn under the chin for use with hard hats. – Ideal for intermittent hearing protection needs. – Replacement tips available. – Noise Reduction Rating (NRR)* 20 dB when the band is worn under-the-chin. 17 dB when the band is worn behind-the-head. CSA Class BL *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation™.