DS18 PRO 4.53" Super Bullet Tweeter, 560W MAX Sold Each 280W RMS/560W Max 1.75" Titanium Compression Tweeter Titanium Diaphragm Aluminum Bullet 4 Ohm Impedance 16 oz. Ferrite Magnet Frequency Response: 1.5 kHz - 20 kHz Recommended HI Pass Crossover: 2 KHz Sensitivity: 108dB Mount Depth: 2.76" Overall Diameter: 4.53"