Hoomia D8 Dual 6mm+9mm Drivers In-Ear Stereo Earphone with Micro Phone Black Dual Driver Design in 6mm + 9mm Monomers, Hear Distinctive Sound of Treble and Bass, as if playing audio speakers Hi-Fi acoustic metal coated diaphragm with metal sound chamber, provide high fidelity sound performance PRS(Pressure Relief System) plus medical grade material ear pads soft touch make it comfortable to wear High quality copper wire increase sound effect, flat cable design tangle-free In-line micphone, won't miss the call while listening music