The noise of machinery in factories and factories can reach 120 dB. Since 85 dB can already cause permanent hearing damage, it is essential to use earplugs. NoNoise LAVORO earplugs are precisely tuned for optimum attenuation of the frequencies required by music lovers. The average attenuation measured by an independent body (en352-2-2002) is 29.5 db at the highest frequencies (the most harmful). Without silicone. With cord supplied. Clinically tested. Gross weight:60 grams