Replacement foam tips for 3M E-A-Rflex 28 Banded Hearing Protector 320-1000. Not for use without band. • E-A-Rform foam tips react to body temperature for enhanced comfort *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