https://us.astellnkern.com/collections/headphones-iems/products/diana?variant=19245367296059 Beautiful both inside and out Diana is a product created by combining the world renowned IEM technology of Jerry Harvey Audio, which has long been making custom earphones for musicians around the world, and the expertise of Astell&Kern reputed for their quality products made in Korea. Like the Full Metal Jacket Siren Series, which is loved by music enthusiasts around the world, we have created Diana out of a full metal shell to produce a top level IEM in terms of both sound and design. Diana features the patented Freqphase from Jerry Harvey Audio and the same new sound bore design applied to Billie Jean. Its impeccably beautiful full metal shell made from aluminum with great precision not only delivers a visually impressive image but also makes the sound more solid so you enjoy the most ideal sound without distortion in all sound ranges. The 3-Way 3-Drivers, optimized size, plus silver tinsel and anaerobic copper cables used in high-end top cables, come together to provide outstanding sound that cannot be matched in existing IEM products. Created by Jerry Harvey Audio, the inventor of the world’s leading custom earphone and Astell&Kern the favorite of music enthusiasts around the world, Diana lets you enjoy its beautiful design and amazing sound at the same time.