Sony’s most luxurious inner ear-type stereo headphone ever. The vertical arrangement for the 16mm large-diameter unit, an industry first for the inner ear type, achieves excellent sound quality and even a better fit than the previous unit. The design addresses the originality of the parts configuration itself, creating a shape that clearly communicates both uniqueness and function. The entire unit is wrapped with a thin magnesium film, with an emphasis on the unit’s round shape, pulling attention away from other parts. The coloring is mainly piano black, to emphasize a luxury feeling, while aluminum texture is applied on the rounded part.