Double Barrel Speakers use Polk DB651 6.5" speakers. Swivel-mount tweeter allows precise aiming of sound. Polymer/Mica composite cone with butyl rubber surround offers big sound and durability. Speakers feature 60 watts continuous RMS and 180 watts peak power handling with 4-ohm impedance. Polished and anodized aluminum finish remains durable in marine settings. Speaker set will fit any size diameter tower. Pair.