JVC In-Ear Canal Headphones (black) The new JVC In-Ear Canal Headphones employs a range of sound-enhancing technologies including an aluminum evaporation diaphragm a new internal dual-metal structure & aluminum housing. The new aluminum evaporation diaphragm used in the In-Ear Canal Headphones reproduces high-frequency detail more accurately than conventional cellulose or polymer-based diaphragm designs. These red headphones come with a handy carrying case.