DS18 TX1S Tweeter X1 1.38-inch 200 Watts Max Pei Dome Ferrite Tweeters with Mounting Kit Angle, Flush, Surface - Set of 2 (Black/Silver) HIGH EFFICIENCY - They are loud and clear even when hooked up to your factory radio. 200 Watts Max - 50 Watts RMS ANGLE/FLUSH/SURFACE MOUNT - options make these super-versatile, can be installed in almost any ride. KIT INCLUDED IN THE BOX. Mounting depth 0.71-in. Cutout Diameter 2-in. LOW IMPEDANCE - Four-ohms 0.5-in. KSV Coil speakers compensate for the undersized wires found in many of today's cars, and make the most of every watt your car stereo can deliver MATERIAL & SIZE - 1.38" inches PEI Dome for lightweight, shape-retaining properties, and high-temperature handling. Ferrite Magnet made to handle high temperatures 80-250 C SPECS - Frequency response 2K-20K Hz and a Sensitivity of 88dB