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Amazon.com: Loop Quiet Ear Plugs for Noise Reduction – Super Soft, Reusable Hearing Protection in Flexible Silicone for Sleep, Noise Sensitivity - 8 Ear Tips in XS/S/M/L – 26dB & NRR 14
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Amazon.com: TICONN 20 Pairs Foam Ear Plugs for Sleeping Noise Cancelling, 32dB NRR Earplugs for Hearing Protection Travel Study Construction (20 Pairs) : Health & Household
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Loop Quiet Ear Plugs for Sleep, Focus, Travel & Noise Sensitivity – 26dB & NRR 14 Noise Reduction - Walmart.com
What Is the Noise Reduction Rating (NRR) and How to Use It? - NoisyWorld
