I had these in my old car and they're decent for the price, but you can get better. Hertz are one of the best car audio companies so safe to say they'll be better than most at that price but at the end of the day you get what you pay for so they wont be as good as the £200 set etc, so really depends on what you're expecting. They will fit the front as well, but not the rear speakers, they're 13cm IIRC.
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