AIAIAI TMA-2 Modular Headphone Speaker Component S04 - Vibrant Both plugs feature a cable lock that securely locks the cable in place Magnet type: Neodymium The Speaker Unit housing is injection- moulded from durable ABS material The Speaker Unit housing is coated with rubber to give a matte look with a soft feeling. Driver diameter: 40 mm; Resonance frequency: 80 Hz