The Pioneer TS-T110 Tweeters are a pair of 7/8" 120W peak power poly dome tweeters designed for car audio systems. These tweeters have an RMS power range of 40 watts, a sensitivity of 90 dB, and a frequency response of 2500-30000 Hz. They are brand new and come with a California Prop 65 warning related to potential health risks associated with some chemicals used in the product. With a speaker size of 8 inches and a diameter of 7/8 inch, these tweeters are a convenient and powerful addition to enhance the sound quality of your car audio system.