I've had these for two years, but I've used them less than five times. Thank you. [Description of final E4000] Achieves a realistic sense of presence. In addition to not creating emphasized frequency ranges, we have thoroughly focused on the expression of fine sounds, achieving a realistic sense of presence that feels like it's right in front of you. Furthermore, it's a re-cable type with an MMCX connector, so you can replace the cable if it breaks. Housing: Aluminum Driver: 6.4mmΦ dynamic type Sensitivity: 97dB Impedance: 15Ω Weight: 18g Cable length: 1.2m Accessories: Eartips, ear hooks, silicone case, carabiner... Re-cableable Price: 16,800 yen Product introduction: Earphones equipped with a 6.4mm dynamic driver unit. Re-cable type with MMCX connector, allowing cable replacement. The unique "earpiece swing fit mechanism" fits perfectly to the angle of the ear canal. It prevents deformation of the opening and allows sound to be transmitted directly to the eardrum. The adoption of smaller ear hooks than before fits more people's ears. Cable touch noise generated when the cable touches the body while walking is dramatically reduced. Type: Canal type Drive system: Dynamic type