["Description:\nbrand new and high quality\nFeatures:\nthe passive radiator is commonly used in closed speakers for inversion, to enhance the strength and intensity of the .\nThe main function is to replace the inverter tube duct. Compared with conventional inverter speakers, the low frequency response speed of passive radiators is faster and more accurate. Low wind noise.\nTwo size optional. Easy and convenient to use.\nAttention: it is passive radiator,not speaker.No voice coil or drive magnet.\nPassive Radiator only, other accessories demo in the picture is not included!\n\nSpecifications:\nItem Type: Passive Radiator\nMaterial: Plastic+Metal\nSize: (Optional)\n8 inch: horn diameter: 217mm/8.5in, diagonal twisting hole spacing: 208mm/8.1in, opening hole: 185mm/7.2in, counterbore depth+height: 4+57mm/0.15+2.24in\n10 inch: horn diameter: 270mm/10.6in, diagonal twisting hole spacing: 260mm/10.2in, opening hole: 230mm/9.05in, counterbore depth+height: 4+72mm/0.15+2.83in\nColor: Black\nQuantity: 2 PCS\n\nNote:\nNo retail package.\nTransition: 1cm=10mm=0.39inch\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Includes:\n2 x Passive Radiator"]