Pack of 5 solar filter observation cards, 1x4 filter window, 3x5 card frame.;Suitable for naked eye observation of solar eclipses, large sunspots, Venus/Mercury transists without a telescope.;The sun will appear in a natural orange color when viewed through this filter.;Black polymer is the most common filtering material for observing the sun safely.;These viewers are a quality product of Thousand Oaks Optical, Arizona, USA. A manufacturer of safe solar filters for over 30 years.

• Solar Eclipse Viewers (Pack of 5) CE & ISO Certified

Solar Eclipse Viewers (Pack of 5) CE & ISO CertifiedThousand Oaks Optical