Overview3M earplugs, made of foam that expands slowly after being crushed, offer convenience and comfort for many users. Once in the ear, earplugs expand over time for comfortable and safe use. 3M earplugs are manufactured to provide maximum comfort. It is made of hypoallergenic PU foam, which is a soft material, to ensure a perfect fit to the ear and not to cause high pressure inside the ear. Anti-dust surface for better hygiene, durability and comfort. Its conical structure adapts to different ear cup shapes. General features: CE approved. It is cordless. (1110 model has a cord) noise reduction degree: 37 snr protection level: 95 db(a) - 110 db(a) made of skin-compatible polyurethane foam. Areas of use: It can be used in general industrial areas, in case of continuous sound exposure, in high temperature areas. You can use it while sleeping or studying. It is suitable for every ear structure. You can use it against pressure while traveling by plane. It will definitely not harm your ears. You need to follow the rules of hygiene, dirty earplugs can do.