About this item 40mm Large Dynamic Driver: Featuring a high-molecular diaphragm, custom-designed strong magnet, and CCAW (Copper-Clad Aluminum Wire) voice coil, the high-quality materials ensure exceptional sound performance, delivering clear and detailed audio. Lightweight Design: Weighing only about 50g, it offers an almost weightless wearing experience, making it comfortable for long-term use during commutes or extended listening sessions without causing fatigue. Ergonomic Comfort Design: The adjustable stainless steel headband and rotatable ear cups allow the headphones to better fit different head shapes and ear angles, enhancing comfort while optimizing soundstage performance. Semi-Open Design: The semi-open structure provides a more natural and transparent sound. It ensures excellent audio quality while allowing users to stay aware of their surroundings for safety during outdoor use. Additionally, it minimizes sound leakage, reducing disturbance to others. Two Pairs of Ear Pads,