Noise reduction rating of 24dB soundproof earmuffs. - Brand: 3M - Model: Optime 101 - Model Number: H7P3E - Type: Soundproof earmuffs ・Applications: Ideal for environments requiring soundproofing, such as factory work, construction sites, mowing, shooting, and studying. This is an opened item, but it is unused. I will only deal with those who can respond quickly, as slow transactions are a waste of time. Those who wish to pay via ATM or convenience store payment must pay on the same day or the next day of purchase. Please ask any questions you may have. Returns are not accepted to prevent product switching. Please do not purchase if you are a nitpicker, a complainer, or lack common sense. Those seeking perfection should refrain from purchasing. Please purchase only after you are satisfied. No complaints will be accepted after purchase. Please only purchase if you can provide a receipt notification on the day the item arrives. Please be sure to check my profile. #3m #earmuffs