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Speakers turn electrical energy into mechanical energy to move air using a permanent magnet and an electromagnet. The electromagnet is energized when the radio or amplifier if equipped delivers current to the voice coil on the speaker. The voice coil will form a north and south pole that will cause the voice coil and the speaker cone to move in relation to the permanent magnet. This causes the speaker cone to move in two directions producing sound. These original equipment car speakers have been manufactured to fit your GM vehicle providing the same performance durability and service life you expect from General Motors. Model # 15236987 Features: Restore the sound quality of your audio system GM-recommended replacement part for your GM vehicles original factory speaker Offering the quality reliability and durability of GM OE Manufactured to GM OE specification for fit form and function Item Dimensions: 9. 75L x 9. 25W x 4. 25H.