The GLADEN AERO-RING 200 is a set of two self-adhesive sealing rings designed to optimize the installation of 200 mm speakers. Made from dimensionally stable EPDM foam, these rings act as an acoustic sealant and guide between the speaker, the installation opening, and the door trim. This specific construction helps reduce air loss and acoustic short circuits, which leads to improved bass precision and clearer midrange frequencies. Because the EPDM material is moisture-resistant and water-repellent, it remains durable even in the humid environment of a car door. The rings measure 237 mm in outer diameter, 185 mm in inner diameter, and 20 mm in height, providing a sound-absorbing barrier that minimizes disturbing resonances and vibrations in the trim area. You can easily install them thanks to the self-adhesive backing, making them a practical choice for anyone looking to refine their vehicle's sound transmission.