Preprinted generic safe solar viewers. "CE" Certified and absolutely safe for direct solar viewing. Safety information and instruction printed on the backside. They are a great way to advertise and promote any business, planetarium, museum, school or astronomy club. They are used for viewing solar eclipses, sun spots and planetary transits of the sun. All of our stock design glasses are available for custom imprint. Made of eco-friendly double mounted 250 GSM ivory cardboard, they feature 0.16 mm thick PVC lenses.