Tools & Harware Triple FLANGED, Filtered EARPLUGS, Medium, Black, 1 PK 24dB Noise Reduction Rating (NRR) with stoppers inserted lowers potentially dangerous noise levels Hear safe sound levels (with stoppers out) as if you weren't wearing ear plugs EarLock by SureFireretention ring utilizes seven contact points to lock earpiece in place and fit Low-profile design allows you to keep them in place while wearing a mask, helmet, hat, or while Made from hypoallergenic, medical-grade polymer that's soft, durable, and long-lasting