Shade Glasses for Burner Work, Made in the USA These are light protection glasses for air burner work, made by Phillips Safety Products in the USA. The PH202 filter used cuts harmful ultraviolet and infrared light, and also adjusts the transmittance of the yellow flame (around 580nm) produced during glasswork, as well as the blue, green, and red parts, so that the color balance of the original material is not disrupted even when viewed through the glasses. #Glasswork #Tonbodama (glass beads) #Phillips #ShadeGlasses