FD3 Pro use a single dynamic driver. The 12mm large diaphragm of the FD3 Pro is made of Diamond-Like Carbon (DLC) which is both impressively rigid which helps to reduce unneeded distortion and vibration yet also surprisingly light. Inside the FD3 Pro's striking shell lies a driver with a robust magnet of 1.5 Tesla magnetic flux paired with an ultra-fine copper-clad aluminum Japanese Daikoku voice coil for an amazing, powerful sound.