3M H9A Hearing Protector Headband standard
"Key Features & Applications:
Ultra Lightweight Most Versatile earmuff Suitable for broad range of work areas due to better attenuation To be used upto noise levels of 98 dB Noise Reduction Rating: 25dB (When used as directed).
3M Peltor Optime 98 is versatile, over-the-head earmuffs featuring a stainless steel headband for consistent force and effective hearing protection
For noise levels up to 98 dBA
Stainless steel construction resists bending and warping.
Earcup pivot points tilt for optimum comfort and efficiency.
? Ultra light with liquid/foam filled earmuff cushions