Over Ear headphones. Stunning studio quality sound with three drivers - 40 mm graphene dynamic driver + ceramic tweeter + bass reflector deliver. The aluminum alloy sound chamber enhances acoustic response while polymer ''rims'' protect the outer bass reflector for extended flexibility and durability. Expertly tuned by Grammy® winning sound engineer Luca Bignardi for a fully balanced and precise soundstage. Accessories: Removable Oxygen-free Copper Cable, Gold Plated 3.5 mm to 6.3 mm (1/4'') Adapter, Deluxe Travel Case, User Manual. Specifications: Weight: 293 g, Cable Length: 1.35 m, Plug Type: 3.5 mm Gold Plated, Speaker Impedance: 32 Ω, Sensitivity: 104 dB, Frequency Response Range: 20-40,000 Hz, Color: Titanium.