Surefire EarPro EP4 Sonic Defenders Plus Hearing Protection Enhancement MEDIUM Pair 19dB Noise Reduction Rating (NRR) for EP4 Sonic Defenders Plus with stoppers in Lowers potentially dangerous noise levels above 80dB Ergonomic design and multi-flanged stem conforms to ear shape for comfort and earpiece retention Hear safe sound levels as if you weren't wearing ear plugs Made from soft, hypoallergenic, medical-grade polymer