Features: Made of high-quality rubber material, high elasticity, flexible, and not easy to break. This rubber edge is anti-aging-, moderate softness and hardness. Two size optional, it is suitable for 15in/18inches speakers. To replace the old, broken or damaged ones-. Easy and simple to use and operate. Repair- Foam Woofer Edge only, other accessories demo in the picture is not included! Specifications: Item Type: Repair- Foam Woofer Edge Material: Rubber Size: approx 15inches / 18inches Color: Black Quantity: 1PC Methods of replacing: Remove the gasket- and rub off old foam, apply contact cement(not included). Center the surround- evenly as you place it on cone Squeeze the inside of surround to cone with thumb on top and index- finger up inside the frame-, underneath the surround- and go around a few-times until it adheres. Apply elmers wood glue- to outer frame-, press down surround Re-glue gasket- to outer surround-. Package Includes: 1PCx Repair Foam Woofer Edge note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!