Infrared replacement glass for TEC® Sterling and Sterling FR (flame reduced) grills.Fits Sterling II, III, IV, IIFR, IIIFR and IVFR (all are two, three and four burner) grills, including the G series. One glass panel is used per ccoking zone (AKA burner / control knob). Each glass panel is 16 x 9.5 inches (40.1 x 24.2 cm).If you hold a TEC® infrared glass up to a cool white flourescent light the light looks like a darkening orange sunset. The photos show a RadiantWave™ infrared glass. The lower photo shows it with a 6V lantern battery flashlight behind. (And unfortunately, a reflection of the flourescent light on the ceiling.)This is a special order item and may take several weeks to get it in.84790 is TEC #HW0407. (TEC® Radiant Wave grills use 78939 #HW0411 see related items.)