Safety Ear Plug
An earplug is a device that is meant to be inserted in the ear canal to protect the user's ears from loud noises or the intrusion of water, foreign bodies, dust or excessive wind.
There are mainly four types of earplugs for hearing protection: Foam earplugs: Mainly made from either polyvinyl chloride (PVC) or polyurethane (PU) (memory foam), which are compressed (rolled) and put into the ear canal, where they expand to plug it. Silicone earplugs: Which are rolled into a ball and carefully molded to fit over the external portion of the ear canal. Flanged earplugs: Including most types of musicians' or 'Hi-Fi' earplugs. Custom molded earplugs: Made from a mold of the wearer's ear and designed to precisely fit all ear canal shapes. Custom molded is further divided into laboratory-made and "formed in place". Ear Plugs may be either disposable or reusable, with foam and hand rolled silicone ones generally being disposable or for use a relatively limited number of times. Custom molded are non-disposable and made from either acrylic, vinyl, or silicone materials. Custom molded come as either vented (for communication) or non-vented (for high noise). A variation of the traditional foam earplug is the no-roll foam earplug that uses a built-in central stem to push the foam plugs into the ears. These earplugs achieve a seal due to their tapered shape, rather than expansion after being rolled.