15.4 mm Specially-tuned Neodymium, Magnetic Large Dynamic Driver, Bass Enhanced Airflow Channel Design, Double Rear-cavity Damping Acoustic System. Precision-Tuned Front Cover for Enhanced Sonic Transparency, Multi-Pore Acoustic Design with Waveguide Channels. Sponge Ear-tips, Positioning Limit Design, Ensures Greater, Comfort and Stability. Snug and Comfortable Fit, Deeper Bass Response. Modernist Geometric Design, Two-color Options