Tungsten Carbide PencilStainless steel pencil with tungsten carbide point and protective cap. Great for permanently making or etching IVF patient dishes (Culture, ICSI, etc). No VOCs and cannot rub off like permanent marker. Works with glass slides, test tubes, and labware Sharp, tungsten carbide tip etches glass, ceramic, and plastic. For Use With (Application) Used for writing on glass and metal Material Stainless Steel Quantity Each Includes Steel cap Product Type