The innovative shape of the uvex hi-com earplugs reduces the level of sound that normally builds up in the inner ear when wearing hearing protection. Integrated cavities in the direction of the eardrum result in a larger surface area which absorbs more noise The earplugs provide softer acoustics and absorb disruptive noise, as well as allowing excellent speech recognition. Refill box, 300 pairs, loose Colour: Lime Uncorded version Meets EN 352-2 standard and the additional requirement "Warning signal audibility, general" (W) 24-dB noise reduction H: 26 dB, M: 20 dB, L: 18 dB