Tekfusion Ecoofers In-ear Headphones (Ebony Edition) The enclosures have 10mm airtight dynamic transducers loaded with the power of neodymium magnets for accurate vocals and powerful bass. The all new flat cable prevent tangles no matter how you store your earphones. Constructed with natural wood and metal; both of which have low vibration properties compared to plastic used in generic earphones. Ecoofers has a ported enclosure designed with a single vent to implement a bass reflex system that provides a low frequency efficiency for sound enhancement.