The Final Audio Design E2000CS designed the sound quality of this product based on the latest acoustic engineering and psychological research results. Using the usual method of sound creation whereby certain high frequencies are emphasized, you're given to feel vivid sound when you first listen. With E2000CS, not creating a range that is emphasized makes for clear sound quality. Added to this, giving high frequencies the slightest distinctiveness has you experiencing the same sense of realism you would if the music were played right in front of you. With this product, we've aimed at sound quality that makes the music resound pleasantly for a "standard" whose value you feel the more you use it over time rather than just in its appeal when you first listen to it. Compared to a plastic housing, this housing machined from aluminum with a alumite finish firmly supports the driver unit and suppresses unnecessary vibrations. Fitting of a device for the mature listener, this is a design that has a simple shape and a high-quality texture matched with what could be termed classic sound quality. The precision involved in assembling the parts for the driver unit is of the utmost importance. The small-aperture 6.4mm diameter dynamic driver unit boasts an extraordinarily high level of precision. There is an aperture on the back of the housing which act to extend the reproduction band of low frequencies. To prevent sound leakage from the apertures there is a filter inside, and stainless steel mesh has been added to the outside. Taking touch noise into consideration, soft, flexible coated material has been employed. When using ear hooks also, it moves flexibly, making for a good fit. Specifications: Housing: Aluminum Aluminum silver alumite finish (Matt Silver), Driver: 6.4mm diameter dynamic driver, Cable: OFC cable, Sensitivity: 102 dB/mW, Impedance: 16 Ohms, Cord length: 1.2m. Accessories: Silicon ear pieces (E type Black/Black-Red 5 sizes), Ear hook, Pouch.