Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Perfect for any average do-it-yourself, FREE technical support, easy to install4. Enhance the Bass & Make Your Speaker Sounds Great --- Exquisite craft, wear-resistant, help to get nice audio effect for low pitch sound and also help protect the speaker from dust and make it cleaner5. This Speaker surround foam edge is made of high quality rubber, pliable, anti-aging and durable, same surround that professional reconers use. Specifications:Material:rubberColor:BlackSize:195x137mm/7.68x5.39inch(ODxID)Outer diameter: 195mmInner diameter: 137mmRing outer diameter: 178mmInner diameter of the ring: 148mmRemarks: Manual measurement, will have +/-3mm error Weight:38g Package include:2 x Bass horn speaker foams