8ohm 140 watt Super Tweeter.2KHz-20KHz Frequency response.40 x 40 dispersion.Phenolic Diaphragm.Kapton(TM) Bonded for increased power handling and durability The ST200 from Selenium is highly recommended for PA Systems, Stage monitors and most sound reinforcement applications. Extremely sensitive where the reproduction of high frequencies is vital to the performance and low distortion is required. The geometry of the magnetic circuit is optimized with Finite Element Anlaysis (FEA) in order to efficiently utilize and distribute the magnetic field. Highly durable due to bonding the voice coil to a Kapton™ former increasing durability at high temeratures. Provides a simple slot in fix for fast installation.