The large EARasers Musician's HiFi Earplugs are designed to protect your hearing at concerts, rehearsals, or in other settings where you are exposed to loud sounds. The earplugs are made of medical-grade silicone that conforms to the shape of your ear and feature a patented open design that allows sound to travel closer to your eardrum before passing through a variable filter. The filter is designed to reduce sound in the damaging range around 3150 Hz by up to 19 dB while preserving clarity in the rest of the musical spectrum. The earplugs are as close to custom-molded earplugs as you can get without an actual fitting, thanks to parent company Persona Medical's 45 years of hearing-assistance experience. The large-sized earplugs are 1.25 cm wide and fit adult males with above average sized ear canals..