Etymotic Research ER20 ETY-Plugs Hearing Protection Earplugs, Large Fit, Blue Stem with White Tip (Discontinued by Manufacturer) Available in standard size for smaller ear canals, large size for larger ear canals Low cost, ready-fit hearing protection with cord and case Replicates the ear's natural response Sound quality is preserved, speech is clear, not muffled Noise Reduction Rating - 12 dB