Car coaxial speaker 240W max power. High Efficiency MidBass Technology. Our voice coils are able to withstand high temperatures, yet retain its strength and fatigue properties. This gives our speakers the advantage of playing longer with less weight. Material: fiberglass, part position: inside, Rubber has the ability to endure much punishment without showing any signs of damage. It complements the entire structure of the speaker by allowing for continued abuse without wear and tear.