BJKing 004 Hard Hat Ear Muffs, NRR 28dB Adjustable Cap-mounted Ear muff, Helmet Attachable Earmuff

NRR Sound Technology: Designed with 2 layers of professional noise dampening foam, high sealing solid cup and the unique double-shell, the ear muffs offer a high SNR of 34dB for noise cancelling and attach to a hard hat (NOT INCLUDED) and provide hearing protection with a NRR of 28 dB.
Adjustable Headband Design: Designed with retractable stainless steel at the cap-mount Earmuffs, the ear muffs can be adjusted to fit all sizes. ABS plastic cups create a rigid, high strength and impact resistant earmuff to handle tough environments.
ANSI S3. 19 & CE EN352-1 Certified: Lab tested and certified to US and European Standards. Professional Hard Hat Attachment Ear muff for Construction or Manufacturing.
Silence Your World: ideal for construction, manufacturing, maintenance, automotive, woodworking, heavy engineering, mining and operating machinery to protect hearing, especially suitable for work in construction and Manufacturing.
Easy cap-mount Design and Wide Compatibility: Easy to Install and Compatible with most Safety helmets (NOT for Brim Hard Hats)..Super Lightweight and comfortable：A pair weighs only 10oz ( 286g ).