This 5.25 inch Woofer, features 1 inch voice coil with CCAW, Aluminum former, and Neodymium magnet motor system. The main cone body uses PULP with the carbon fiber to make sure the driver has a better stiffness and lower distortion. What’s more, U-yoke is embedded in the bracket to reduce overall height without affecting amplitude, and the overall design meets the requirements for ultra-thin performance.