This Sony MDREX300 in-ear headphones come in black complete with newly developed 13.5mm driver units that reproduce vocal and instrumental sound with vivid clarity. It is vertically positioned in-the-ear headphones for long-term wearing comfort. 3 sizes of hybrid silicone rubber earbuds (small, medium and large) mean that you get a secure fitting whatever the size of your ear is. Other features include a compact carry case, extension cable, bass boost and a 1.2 metre cord length.