Boss Audio MR4.3B Marine 4 3-Way 200-Watt Enclosed System Speakers VPO2_F2DRO51

View larger Midrange - Poly Injection Polyurethane, categorized as a polymer, is a resilient, flexible, and durable manufactured material that can take the place of paint, cotton, rubber, metal, or wood in thousands of applications across virtually all fields. It can be hard like fiberglass, squishy like upholstery foam, protective like varnish, bouncy like rubber, or sticky like glue. In the specific case of our cones, this material allows for maximum flexibility that produces great sounding speakers lasting you a long, long time. Surround - Rubber Rubber is a synthetic (man made) material and is valued for its chemical inertness, impermeability to air, and the ability to endure or resist exposure to the many types of weather fronts. Rubber has applications from sports equipment to automotive parts, the medical industry and more. Did you know that most modern chewing gum uses food-grade rubber as the central gum base, which contributes not only the gum s elasticity but an obstinate, s