SHCA PRO TW1 Pro Audio Mini Bullet Tweeter 1" VC 4 ohm (Pair) Specifications: Nominal Diameter = 3.5" Nominal Impedance = 4 OHM AES Power = 60W Program Power = 120W Peak Power = 240W Sensitivity (1w/1m) = 103dB Frequency Response = 3.5Hz-20KHz Recommended HI Pass Crossover = 4KHz Motor: Voice Coil Diameter = 1" / 25.4mm Voice Coil Former Material = KAPTON Winding Material = CCAW Diaphragm Material = ALUMINUM Magnet Material = FERRITE Body Material = ALUMINUM Measurement: Overall Diameter = 3.78" / 96mm Overall Depth = 1.77" / 45mm Front Mount Baffle Cutout = 2.83"/ 72mm Mounting Depth = 1.56" / 39.5mm