Polk Audio 4" Coaxial Car - Marine Speaker DB401

4" 2-way car speakers (pair) Dynamic Balance polymer/mica composite woofer with butyl rubber surround 3/4" liquid-cooled silk/polymer composite dome tweeter Neodymium tweeter magnet Kapton voice coil built-in 2-way crossover network db-design grilles stainless steel mounting hardware power range: 4-45 watts RMS (135 watts peak power) frequency response: 85-22,000 Hz sensitivity: 91 dB top-mount depth: 1-7/8"