Shure SRH1540 Premium Closed-Back Headphones 40 mm neodymium drivers deliver superior acoustic performance for an expansive soundstage with clear, extended highs and warm bass Closed-back, circumaural design rests comfortably over the ears and reduces background noise. Ergonomic dual-frame, padded headband is lightweight and fully adjustable for hours of listening comfort Lightweight construction featuring aircraft-grade aluminum alloy yoke and carbon fiber cap for enhanced durability. Cable Length = 6 ft (1.8 m) Steel driver frame with vented center pole piece improves linearity and eliminates internal resonance for consistent performance at all listening levels Refer user manual for troubleshooting steps