Check the listing for details. Speaker Spacer Ring Tweeter Speaker Spacer for BMW 3 (E46) for 6.5". Color: Black, Condition: New. Listed at 16.46 USD. Advantage:Car audio speaker spacer ring aid in audio speaker installation, play an important part in reducing resonance and making the speakers stronger.Replace new car speaker spacers adapter, provide better sound quality,fixed speakers to reduce door resonance.The ring mounting bracket is good partner for mounting new speaker. You can install the speakers you want by adding extra depth.Material:Speaker mounting bracket ring made of good ABS material, will not oxidize moisture-proof, durable, wear-resistant, long service life, smooth surface, not easy to fade, no scratches.Functionality:Material:ABSFit for Speaker Dia:6.5"Depth: 7mm / 0.28"Inner Diameter: 145mm/5.71"External Diameter: 164mm/6.46"Compatibility:the speaker ring fits most 6.5 inch speakers.