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Car speaker foam ring for 6" 6.5" 6.75" 7" Coaxial Speakers Marine Speakers Spacer. Type: Soundproof Cotton Spnge Foam Material: Japanese Polyurethane High Density and High Resilience PU self-crusting sponge Rubber Foam Item Diameter : 7.67 inch(19.5cm) +/- 2mm Item Inner Diameter : 5.7 inch(14.5cm) +/- 2mm Item Height : 0.98 inch(2.5cm) Package Included: 4pcs Insulation ring adhesive has strong stickiness, is not easy to fall off, and is easy to install. Memory Foam durable compression and extrusion resistance, improve Speaker sound effect Speaker foam ring prevent sound quality diffusion, absorb car door echo, enhance horn sound effect and enhance sound effect