Monoprice 108251 3-Way Bookshelf Speakers (Pair) Features an 8-Inch polypropylene woofer, a 4-Inch polypropylene mid-range driver, and a 1/2-Inch dome tweeter on each unit Rated for up to 120 watts of power at 8 ohms Spring-loaded speaker wire connectors can accept wires up to 16-guage thick