Plugfones FREEREIGN™ XC Earplug Headphones (NRR 27 31) Class_Class 1 (SLC80 10 13dB) DO SLEEPSOFT EARPLUGS HAVE MAXIMAL DO SLEEPSOFT EARPLUGS HAVE MAXIMAL ATTENUATION motor sports a Quick Start Guide delivering a Noise Reduction Rating of 31 dB with the tapered foam tips or 27 dB with the ComforTiered™ silicone tips
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