Powerstands Tire Warmers - Yellow TW-SBK-YLW Heavy duty fabric with a heat sensitive liner for better heat retention 1 degree incremental adjustment from 104 degrees to 211 degrees fahrenheit Digital thermostatically controlled 110 volt, 450 watt front, 550 watt rear Fits 120/60-120/70-17 front and 180/55-190/50/55-17 rear tires