The 1100 is an uncorded Ear Plug, it is made from soft hypoallergenic PU foam material to provide maximum comfort and low pressure inside the ear.
30pairs/Lot 3M 1100 Disposable EarPlug Foam Noise Reducer Free Shipping - AliExpress
1100 SNR 37 dB orange foam disposable ear plug without cord - 228100 - 3M
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1100 SNR 37 dB orange foam disposable ear plug without cord - 228100 - 3M