●4 x 10" 4 x Speaker Gasket for 4-bit Units ●Made of high vibration absorbing EVA material, perfect for heavy bass woofer units and guitar (base) amplifier units ●Thickness: 0.2 inches (6 mm), Inner Diameter: 9.1 inches (232 mm), Outer Diameter: 9.9 inches (252 ●No adhesive material is included on the surface.