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: 100% Brand 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: 5cm/2.0inSuitable 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