Audeze Euclid Closed-Back Planar Magnetic In-Ear - Audeze 18mm planar magnet drive, Highest dynamic range of all in-ears in this category, MMCX Connectros for quick and easy adjustments, Light, precision-milled aluminum housing with ergonomic design, including SpinFit and Comply EarTips in different sizes, 3.5 mm jack, 4.4 mm symmetrical, 6.3 mm jack, MMCX, transmission range 10 - 50,000 Hz, max.SPL 120 dB, impedance 12 ohms, weight without cable 15g