3M EAR 318-1005 rub-free anti-noise foam earplugs (with cable)

3M EAR 318-1005 Rubbing-free foam earplugs (with cable)
Model: 318-1005
NRR: 28 dB SNR: 38dB
No need to rub, easy to use, clean, hygienic
mushroom shape, small and beautiful, can be quickly inserted into the ear canal to
use EA R form patented foam,
which fits closely to the ear canal. The foam is specially designed for NASA space shuttle.
Packing: 500 sets /box, 3 boxes/box=1500
sets. NRR: According to the American standard ANSI S3.19-1974 The detected single value noise reduction value.
SNR:
The correct wearing and removal method of single value noise reduction foam earplugs tested according to the international standard ISO 4969-2
1. Wash your hands and rub the round part of the earplugs thin (only applicable to bullet and cylindrical earplugs)
2 , With the other hand around the back of the head, pull the ear up, and pull the round part of the earplug into the ear. This step is suitable for all earplugs.
3.
Hold the earplugs gently until the earplugs are fully inflated and shaped. 4. Remove the earplugs for comfort and safety. Please gently pull out the earplugs while rotating.