The valve of the present invention provides a one-piece valve stem piston having a piston head and a piston stem. The first particles comprise cerium oxide, and second particle comprises at least one member selected from the group consisting of silicon oxides, aluminum oxides and zirconium oxides. The determination unit determines whether a letter input through the input unit is uppercase or lowercase. At least one cutting blade tool is adjustably mounted along a length of the measurement bar. There may be optionally included in the reactive gas mixture nitrogen and inert gases for control purposes, but excluded from the reactive gas mixture are oxidizing gases containing carbon and oxygen. The images may be graphics files or standard files with an associated thumbnail image.