The item consists of molded parts made from 30% glass-filled nylon. It has a filter material made from heat-resistant plastic, which meets either MIL-P-21105 or MIL-P-5425 standards. The filter color is translucent white, and the legend material is also transparent acrylic that adheres to either MIL-P-21105 or MIL-P-5425 specifications. The window material is high-temperature resistant, self-extinguishing polycarbonate. The style is B, with a legend type IIA. Specific dimensions for photo-etching or engraving are 0.090 in. H, 0.0151 in. Porm, and a line width of 0.003 in. in the area reserved for legend type IIA.