Pair (2pcs) 1000 Watts Titanium Compression Driver 1.75" Screw-On Horn Driver Tweeter 1.75" voice coil / 21oz. magnet 1000 Watts PMPO / Titanium dome Sensitivity: 100dB (W/M) / Frequency response: 800Hz - 18KHz Thread size: 1/ 0.375, Diameter: 34.2--34.3 mm, Impedance: 8ohm Pair (2pcs) of 1.75" Voice Coil Compression Driver