Atlantic Technology IC-6.1-S 6.5-inch Thin Bezel In-Ceiling LCR Speaker (Single) Superb sound for modest home theaters or whole-house audio Ultra-thin bezel design Magnetically attached grills Well-suited for surround channel use in 5.1 or 7.1 systems 6-1/2" Polypropylene woofer with 1" pivoting silk dome tweeter