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Focal 165CA1 SG 2-Way 6.5-inch Coaxial Car Speakers Bundle with Fast Rings 3-Pc Audio Enhancement Kit. Rings Increase Mid-Bass, Reduce Vibration and Rear Reflection for Low Distortion - Walmart.com
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Stinger Roadkill RKFR6 FAST Rings 6-piece foam baffle kit — enhance the sound of your new 6", 6-1/2", or 6-3/4" speakers at Crutchfield
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