Rainbow Symphony Solar Eclipse Viewer for Direct Solar Viewing, Package of 25 Makes the study of light and color fun and unforgettable Features an optical density five or greater and are "CE" certified Create a sharper orange colored image of the sun Filters out 100% of harmful ultra-violet, 100% of harmful infrared, and 99.999% of intense visible light Absolutely safe for direct solar viewing of solar eclipses, sun spots and other solar phenomenon