Please contract us firstly If there are any problems when you received the package. Speaker unit size: 8. Size(L X W X H): 350mm x 245mm x 85mm / 13.78 ” x 9.65″ x 3.3. Sound type: full frequency (with treble) subwoofer. The external configuration of high strength stainless steel horn protection net cover. 8 inch 800W high power design, with the volume controller. Low frequency ability of the bass horn, high quality low tone output. Fine workmanship and good performance. Easy to install, can be installed directly under the driver’s seat. Durable in use. We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. Please allow 0.5-1 inch difference due to manual measurement. Although instruction is included. Professional Installation Is Highly Recommended! Installation instruciton not inclued. If you are satisfied with our item, could you kindly give us 5 stars feedback? Thank you for your cooperation! We check all items before sending out. All products are brand new, never been used or refurbished. Most packets arrive in 5 days. If there is any delay, it may be caused by bad weather, busy season and some other reasons. We are not responsible for wrong or undeliverable address. We are only responsible for once re-sending expense for replacement due to defects. Good communication is helpful for both of us to resolve any problems and issues. We have always been doing our best to provide the best service and reliable products for every customer. We will reply your emails and questions within 24 hours. We are a company specializing in motorcycle racing parts accessories, Industry accessories, Home Garden accessories, we provide high-quality products at affordable prices and excellent service.