Astrotec AS100 PRO Semi Open-Air Foldable On-Ear Portable Stereo Music DJ Headphones Enhanced Bass and High-Fidelity Sound Large 40mm rare earth permanent magnet moving coil drive unit to deliver a warm, enthusiastic and atmospheric sound stage Ultra-compact for portability, with multi-axis movements and fast folding design Semi-open style and tuned to provide a warm sound signature with strong lows Mangnesium alloy head frame, retro vintage design, metal mesh structure inlaid metal nameplate Practical single-sided headphone cable with high-quality leather ear and head pads