6.5" coax speaker with 3/4" dome tweeter and 6.5" polypropylene woofer, in a durable rock enclosure. Transformer option available.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.