Safety comes first! Wearing the Snapmaker laser safety glasses, you are protected with an optical density of 6+ (190-540nm) during laser engraving or machining production methods. Thanks to the hard red-tinted polycarbonate plastic, Violet, Ultra violet, green, blue and infrared laser light is filtered out. The effective light transmission percentage is only 8.8% and the glasses have a widened side so that you are also protected from light from the side.