Features: A low frequency passive radiator membrane vibrating plate for speakers to e the effect. matters which maximum strength and durability for long-lasting use. Newly improved radiator, allows you to mass tune passive radiator for the for tuning frequency and for . Outstanding tone, better enjoy, bring you a strong . Suitable for use in a closed cabinet to e the , widely used for speaker, woofer, loudspeaker, vibrating. Specifications: Metal+Rubber Color: Black Diameter Unit of Measure: Approx. 160 mm/6.29 inch Thickness: Approx. 10 mm/ 0.39 inch, 65 Degrees Mounting Hole: Approx. 144.5 mm/5.68 inch Inner Diameter: Approx. 98 mm/3.85 inch Note: Bass diaphragm only, other accessories demo in the picture are not included! Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you mind. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Pair 6.5-inch 160mm Bass Speaker Vibration Membrane