Reducing outside noise for high-intensity listening, the MDR-EX71SL is Sony's first closed type Fontopia Design Bud Style Headphones. Hear the powerful, resonant bass response. Additional features include a super-light in-the-ear design, new, super-small 9 mm drivers which are ultra-compact drivers that produce powerful sound with space left over for the sonic isolation of the newly-designed soft silicon earbuds. Two sizes of earbuds that accommodate a full range of ears, an ultra-high-power neodymium magnet, a hard carrying case, and earbud holder are also supplied. Sony makes listening on the go even better - the MDR-EX71SL.