79 x 79 mm / 3.1 x 3.1" High power Compression Tweeter 4 ohm, 30 / 100 W, SPL 100 dB, 3- 25 KHz25 mm / 1" copper-clad aluminium round wire voice coil Aluminium dome, aluminum cast baffle, aluminum bullet Including optional highpass filter (3,3µF capacitor)