Polk Audio RM7400T/RM40T are sleek-looking, shielded floor-standing left/right speakers designed to be used together as part of a home theater surround setup. The speakers feature a titanium or pewter metallic finish. Each speaker has two 4.5" (11.43 cm) mid-range range shielded drivers made from a polymer composite, and one 1" (2.54 cm) silk/polymer composite dome tweeter. The enclosure is made from a heavy-duty aluminum that is curved to fit well with your home theater setup and flat-panel display.