Denon AH-D1100 Advanced Over-Ear Headphones (Black) Newly designed 50mm drivers use Neodymium magnets and feature Denon's exclusive Microfiber diaphragm technology Precision Aluminum ear cups with new soft protein leather foam ear-cushions Denon's Acoustic Optimizer design improves low frequency extension and smoothes overall response by precisely adjusting the sound pressure balance behind and in front of the driver diaphragm 32-ohm impedence with 101dB/mW sensitivity mean these premium headphones can be successfully driven by portable music devices Accessories include a 3.5m extension cable, a 3.5mm to 1/4" adapter jack and a soft cary pouch