The 2010 Custom Autosound bracketed dual dash mount speakers are designed to replace OEM speakers generally held in-place by metal brackets. These speakers give you stereo sound from your original mono locations. This 4 inch by 10 inch mount features two 4 Inch, 100 Watt Speakers designed to align and mount in your factory speaker location. If you have an original 8 or 10 ohm radio, you may still use this speaker, but you will have to wire it in series and may or may not have to add an inline resistor. Please be careful when using with an original mono radio as improper wiring may fry your original, 8 or 10 ohm radio.