3M - Earmuffs: Listen-Only, 31 dB NRR Behind the Neck, 31 dB NRR Under the Chin, Polyurethane Cushion - 39661954 - MSC Industrial Supply
SensGard NRR 31 Hearing Protectors - Lee Valley Tools
3M Peltor Hard Hat Cap Mounted Earmuffs 31 NRR Black 1 Pair X5p3e for sale online | eBay
Decibullz Custom Moldable Earplugs 31DB NRR
3M PELTOR X5 Earmuffs, Over-The-Head, NRR 31 dB - Walmart.com
3M Peltor X5A HeadBand Ear Muffs (NRR 31) - 3M
Amazon.com: Browning Hearing Protection for Shooting by Decibullz Custom-Molded Earplugs, 31-Decibel Noise Reduction Rating (NRR), Includes Lanyard and Travel Case : Sports & Outdoors