FiiO JT7 Over-Ear Planar Magnetic Headphones, 95x86mm Planar Driver, 3µm Ultra-Thin Diaphragm, Foldable Lightweight Design, Detachable 4.4mm/3.5mm Cable for Audiophiles (Black). Dual-Sided High-Density Magnet Array The dual-sided N52 neodymium magnetic array provides strong magnetic force, achieving high sensitivity of 92dB/mW.