["Description:\nbrand new and high quality\nFeatures:\nThe radiator is also called passive speaker. It is used to replace the inverted tube. \nIt has low frequency dive depth, fast sense of speed, low wind noise.\nIt is suitable for all kinds of speakers and other devices.\nIt can transfer the burden of producing from small-sized unit to larger-sized passive radiator (if the unit wants to produce the same loudness sound in the frequency range at the \"- 3dB\" point, it needs a large amount of air flow propulsion). At this for time, the passive radiator can carry out a larger linear vibration (internal and external reciprocating motion of the paper basin).\nThe low frequency response point extends lower. The design uses a smaller size of unit, which makes the and if response more accurate and better separation.\nVarious colors and sizes to choose from. Easy and convenient to use and operate.\nSpeaker Diaphragm Auxiliary only, other accessories demo in the picture is not included!\n\nSpecifications:\nItem Type: Speaker Diaphragm Auxiliary\nMaterial: Rubber+Metal\nSize: Diameter: 48mm/1.8in, 56mm/2.2in, 78mm/3.07in\nColor: Black, Red, Blue\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 Speaker Diaphragm Auxiliary"]