Description: brand new and high quality Features: Made of high-quality material, durable, firm and stable for us to use. The radiator, also known as the passive speaker, is used to replace the inve more→rter. It has low frequency diving depth, faster speed sense, and low wind noise. So it's a good choice for friends who like to dive deep, but have higher requirements for speed to make subwoofer with radiation basin. Three sizes optional. Easy and convenient to use. Attention: it is not a speaker, no magnet, it can make sound independently. Passive Radiator only, other accessories demo in the picture is not included Specifications: Item Type: Passive Radiator Material: Plastic=Metal Size: (Optional) …