Blaupunkt TW1B 1" Silk Dome Neo Magnet Tweeter. Strong Neodymium Magnet. 2 Way Mount System: Flush or Angle. Overall Depth: 24mm (0.94"). Mounting Depth: 18mm (0.71"). Cutout diameter: 39mm (1.54") ABS Housing for Durability, Strong heat resistance, Strong impact resistance. 25mm Silk Dome Diaphragm. 20mm CCAW Voice Coil. Impedance: 4 Ohms Power(per pair): 50W RMS / 100W MAX Frequency Response: 3.5KHz - 20KHz. Sensitivity: 92dB @ 1W / 1M MODEL NO - TW1B