3M Personal Protective Equipment Standard Nrr 31 Db, Black, One Size Fits Most: Safety Ear Muffs: Amazon.com: Tools & Home Improvement
3M X4A PELTOR X Series Earmuffs, Over-The-Head, NRR 27 Decibel
3M X3A Peltor Black And Red Model X3A/37272(AAD) Over-The-Head Hearing Conservation Earmuffs, English, 30.68 fl. oz., Plastic, 5.7" x 4.5" x 8.2": Amazon.com: Tools & Home Improvement