Textured Pure Silk Domes with ferro-fluid cooling and damping promote clear and well-extended high-frequency response, superb transparency and a tremendous spaciousness. Mineral-Filled Polypropylene Cones deliver natural, detailed midrange performance in addition to smooth, well-articulated and well-extended bass response. Rigid IRP™ Injection-Molded Ribbed Polymer Chassis. Easy Installation! Unique hidden spring clamps make installation a snap!