These push-to-fit foam earplugs create a hygienic, noise-reducing seal in the earcanal with soft foam, a smooth tapered shape and paddle stems. Push-to-fit design makes fitting hearing protection easy. - Push-to-fit style means no earplug roll down required - Soft purple foam is fused with the LiveWire stem. - Foam tips stay clean, even when your hands are dirty. - Noise Reduction Rating (NRR)*: 29 dB. CSA Class AL *The NRR may overestimate the hearing protection provided during typical use. 3M recommends reducing the NRR by 50 percent for estimating the amount of noise reduction provided. 3M is Leading the Advancement of Hearing Conservation.