Ceramic, selected for its resistance to chemicals, corrosion, wear, and heat, is commonly used in laser, aerospace, semi-conductor, and industrial applications. Often supplied in a ceramic tube shape, it can come in various inner and outer diameters, thicknesses, and lengths with single or multiple bores, and may be machinable. Microwave, vacuum, and laser ceramic tube products are also available. A ceramic rod can be used as an insulator in mass spectrometer and vacuum systems. Ceramic material can be ISO-certified and made of alumina, quartz, zirconia, and other materials.