Without electronics, these earplugs don't amplify any sounds, but the custom moulding mass of steel shot suspended in silicone make this hearing protection much more effective then disposable ear plugs. The mass of imbedded steel shot helps dissipate harmful sounds and since it can be easily seen through the clear shell, it also acts as an attention-getter on the range. The custom fit provides comfortable and effective hearing protection of +/- 26 db NRR.