... steel, nickel coated ironCeramic material: talc powder& olefin, 92%Al2O3,99%Al2O3Bakelite material is also available, black colorTerminal block type ... :4)Ceramic material: talc powder& olefin, 92%Al2O3,99%Al2O35)Bakelite material is also available, black color4) ... Ceramic material: talc powder& olefin, 92%Al2O3,99%Al2O35)Bakelite material is also available, black color Ceramic ...