Features:1.Noise-proof and noise-reducing earmuffs for use with V-type helmets.2.The helmet mount version can be mounted directly on many industrial safety helmets without the need for additional accessories.3.A high-density foam pad that provides a high-quality, low-noise seal for the wearer's comfort.4.This protection is based on a two-shell technology that minimizes resonance in the enclosure for optimum high frequency attenuation.5.Sealed ring width filled with a high density sponge for optimum fit and reduced contact pressure.Specification:Features:Noise-proof and noise-reducing earmuffs for use with V-type helmets. The helmet mount version can be mounted directly on many industrial safety helmets without the need for additional accessories. A high-density foam pad that provides a high-quality, low-noise seal for the wearer's comfort. This protection is based on a two-shell technology that minimizes resonance in the enclosure for optimum high frequency attenuation. The acoustic connection between the inner and outer casings provides maximum low frequency attenuation. Sealed ring width filled with a high density sponge for optimum fit and reduced contact pressure. Meet the needs of industrial applications in many noisy environments. Specification:Condition: NewModel: with helmet type earmuffsMaterial: PVCColor: BlackNoise reduction rate: 27dbSignal to noise ratio: 31dbExecutive standard: ceFunction: anti-noise, soundproofWearing method: wearing a helmetLining material: high density spongeCup cover thickness: 5cm2.0inSuitable for noisy environments: various noise environments such as construction sites and factoriesUse range: hearing protection, helmet matchingUses: General industrial use, such as facility maintenance, grinding, electrical, machine operation, grinding, welding, dismantling, painting, sand blasting, assembly, cleaning.Recommended industries: transportation, pharmaceuticals, construction, automotive, military tactics, maintenance and operations (MRO), mining, military maintenance, metal processing, oil and gas, general manufacturing.Package List:1 * Pair of hard hat earmuffs