5.25 coaxial speaker in a durable, waterproof rock enclosure. 3/4" dome tweeter, 5.25" polypropylene woofer. 75 watt output. Rockustics speakers are built to last, with each rock speaker enclosure made of a proprietary resin with marble dust and texturing agents. The color of each speaker is incorporated throughout the material so the speaker will retain a natural look even if the housing is chipped.