Delivering high-quality audio with every use, the Pyle PL42BL full-range speakers are equipped with a blue poly injection cone, non-fatiguing butyl rubber surround, 0.5-inch neodymium film dome tweeter, and a high temperature voice coil. The blue poly injection cone on the Pyle 4-inch car speaker is durable and able to handle environmental changes as well as wear and tear from being in a car. The butyl rubber surround on the two-way automotive speaker ensures that the cone is able to vibrate freely to produce the wide range of sounds clearly. With the dome tweeters on the Pyle 4-inch car speaker, the high notes and sounds produced are evenly distributed throughout the car. The two-way automotive speaker comes in a set of two so that they can work together to provide an even sound as well. Additional specifications for the Pyle PL42BL include a frequency response of 110 Hz to 20 kHz, 88 dB sensitivity, a 4-Ohm impedance, and an RMS power handling of 90 watts. Due to the standard size of the Pyle 4-inch car speaker, people should be able to fit the speaker into most 4-inch OEM locations.