UVEX Hi-Com Ear Plug Uncorded Refill Pack 300 PairsIntegrated 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. Each General features Refill box, 300 pairs, loose colour: lime Uncorded version Protective features meets EN 352 2 standard and the additional requirement "Warning signal audibility, general" (W) 24 dB noise reduction H: 26 dB,