Die Cast Aluminum Super Tweeter - 4 Ohms Impedance * Die Cast Frame - Ferro Fluid Enhanced Voice Coil * 1.5 inches High Temperature Kapton Voice Coil - Sensitivity: 102dB (1w/1m) * Neodymium Magnet Structure - Frequency Response: 2.5k-20kHz * 200 Watts RMS/400 Watts Rated Power - 4.52 inches Diameter/2.73 inches Mounting Depth