This is the GE Cap Mounted Earmuff with 25dB NRR (Noises Reduction Rating). Features: soft padding on earcups that provides maximum comfort and protection from noises, adjustable earcup pivot points tilt for wearers comfort, mount to comfortable fit earmuff with most slotted hard hat and adjustable stainless steel strong wires. It meets ANSI S3.19-1974 Standard.