1. Optical quality glass substrates and coatings
2. Very low reflection multilayer coating, streak-free, plane-parallel substrate
3. Used in combination with other Baader filters to provide sharper images
4. Standard 1.25 inch filter threads for 1.25 inch eyepieces and other accessories
5. Comes with a plastic case to keep it safe and clean when not in use
6. Net weight: about 7g