These Gibraltar 8 inch 4 lug batter side power hoops are great metal replacement 4-hole drum hoops. They are constructed of steel and have a chrome finish. The steel power hoops can be used for toms and snare drums. They are 2.3mm heavy-duty chrome hoops. They are 8 inches in diameter. They provide not only consistent shape but they provide consistent tension as well. These features result in a clearer sound.