Die Cast Plastic Frame180 Watts RMS/360 Watts Max - Bolt hole dimension: 4.5mm×6mm(4×).4 Ohm Impedance - Diameter: F120mm.Frequency Response: 3 KHz-18 KHz - Mounting depth: 53mm.Sensitivity: 98 dB/w/m - Total depth: 61 mm.Number of bolt holes: 4 This die-cast titanium super tweeter will allow you to achieve the highest highs! This 1.75" aluminum driver contains a 1.75" titanium diaphragm for sweet, accurate highs. This 180 watt tweeter isn't lacking for power. Frequency response: 3 - 18 kHz. 4 ohm impedance.