3M Pro-Grade Noise-Reducing Earmuff, NRR 30 dB, Lightweight and Adjustable, Black, One Size - Amazon.com
3M X2A Peltor Black And Yellow Model X2A/37271(AAD) Over-The-Head Hearing Conservation Earmuffs, English, 9.6642 fl. oz., Plastic, 5.7" x 4.5" x 8.2": Amazon.com: Tools & Home Improvement
3M H10A Peltor Optime 105 Over the Head Earmuff, Ear Protectors, Hearing Protection, NRR 30 dB,Black, Red - Safety Ear Muffs - Amazon.com