HiFi Man HE-R10D are closed-back headphones designed for a natural and detailed audio performance. It uses a HiFi Man’s Topology diaphragm design with 50mm dynamic drivers to deliver a sound not found in most true wireless headphones. Headphone Cup Build The HE-R10 dynamic headphone cups are made from CNC woodcarving and aviation aluminium, which has a large internal space to provide sufficient volume and ‘breathing room’ to the powerful drivers. 50mm Dynamic Driver The HiFi Man HE-R10 dynamic headphones have a 50mm dynamic driver that has a high sensitivity due to the use of a rare earth magnet. This is combined with HiFi Man’s Topology Diaphragm design, which is a diaphragm that features a special nanoparticle coating applied to its surface. This provides a natural and detailed sound, with high frequency response up to 30kHz Leather-Wrapped Box HiFi Man’s HE-R10D come in a box with a small hardback owner's guide that includes photography, history and important information on the headphones. It also comes with detachable cables.