Detailed Product Description Thermostat ceramics:Material: steatite ceramics or alumina ceramicsFeatures: High insulation, anti-corrosion, high temperature, etc.Size: ceramic ring diameter 12 mm, diameter of 7.8 millimeters, thickness 4 mm and 3 mmColor: Red and WhiteWe can produce more kinds of ceramic gasket for thermostat,if you have any demand,please send us your details with drawing